OLD RADIOS, RADIO-GRAMS.

Some pictures of BEFORE and AFTER restoration and re-engineering work...


1. Healing BEFORE.

Healing578E-front-before-restore1.jpg

See the 15Watt fridge light bulb, top left, which over heated and degraded the fragile
plastic dial drum.

Dial cord had been badly installed by earlier tech, and never fixed, and radio was not
used for 20 years.

All old electrolytic caps were faulty, along with many other parts.

2. Healing BEFORE.

Healing578E-rear-before-restore2.jpg

See front view of chassis, and 15W lamp is top right, and very poor design from 1950

3, Healing BEFORE.

Healing578E-underchassis-before-restore3.jpg

See 3 grey colored electrolytic caps installed in 1963. The 1963 repair ticket still tied to the power cord
in 2011 listed the 3 caps
and one 6U7G IF amp tube, cost was 5 pounds, about a week's average wages
equal to about $1,050 av weekly earnings
in 2012 money. This indicated the lady who owned the radio
had been ripped off badly, because the repair should
have cost $100 maximum, or 10 shillings, 10/-, in
1963 money!

Notice than many minor parts appear to be stocks from before WW2, such as the black tubular capacitors
and all resistors.


4, Healing BEFORE.

Healing578E-underchassis-before-restore4.jpg

Close up of under the chassis before work. See the dial cord ran around a rubber bush at top.
The rubber has hardened, and a
deep groove had formed from dial cord pressure over a long
time, preventing correct operation. The rubber bush was removed, and a different shaft fitted,
giving a
slower tuning rate especially useful for short wave bands. Notice the bone to the right side,
no doubt a child had been eating
a mutton chop over 50 years ago and somehow had managed
to drop the bone which ended up wedged in under the chassis.

The radio was unaffected. 

5. Healing AFTER.

Healing-reformed-chas-front2-nov11.jpg

Dial cord is replaced, added switch to left side, better electrolytic caps used, and LED lamps set up to replace
15W 240V mains lamp to illuminate drum dial without any heating. Drum might now last another 50+ years.
Dial cord arrangement shown above was first tried, but was not as original. The dial cord arrangement
shown below
in image 6 was how the final arrangement was done, close to the original method. 

6, Healing AFTER

healing-reformed-rearchassis9-nov11.jpg

Two dial cords were used, each with its own tension spring.

7. Healing After.

healing-reformed-frontcab3.jpg

The cabinet had many unsightly blemishes. The finish was a combination of both lacquer and french polish,
and evidence suggested the finish had been "touched up" of fiddled with some 60 years ago.
The top of the cabinet
and all brown painted edging was in poor condition with areas of the walnut veneer
having been sanded down to paper thin to try
to remove damage from wet vases of flowers or hot objects etc.
I carefully sanded brown edgings and applied new brown paint and re-coated with french polish.
Some
carefully applied stain was applied to thin walnut veneer, 3 coats of french polish were applied all over,
and
the cabinet began to look very good.
The drum dial sits behind a curved perspex guard held in place by a bakelite escutcheon.

The old perspex had become yellowed and unclear, and was replaced with slightly thicker plastic
obtained locally.

The escutcheon was cracked and needed re-gluing together with epoxy and all re-fitted properly.
Different brown bakelite knobs were fitted because one was missing, and I added a new switch.
The cloth covering the loudspeaker was very well cleaned. The loudspeaker was in terrible condition
needing re-gluing of the cone edge to metal basket and and re-aligning.

8. Healing AFTER.

healing-reformed-rearchassis6-nov11.jpg

9. Healing AFTER.
healing-reformed-rearchassis7-nov11.jpg

8 and 9 show the rear chassis panel with new power cord, accessible mains fuse, RCA sockets,
new EL34 and 6SJ7 audio
amp tubes, new ferrite rod antenna and LED dial lighting fitted onto a
sculptured wood block.    



10. Healing AFTER.

healing-reformed-rearchassis8-nov11.jpg

This shows the repaired shielding around 6J8 and 6U7. 6J8 socket and tuning assembly were resting on soft
rubber grommets to prevent sound from speaker causing microphonic distortions. All grommets had perished
and become weak and brittle, so all were removed, with silicone used as a replacement which gave the same
soft mounting. The silicone is likely to last 500 years.

11. Healing, AFTER.

Healing-reformed-underchassis-nov11.jpg

Under the chassis looks a lot different with about twice the number of original R&C parts used for a
completely revised
schematic for all except the short wave tuning coils of the radio.
Short wave reception needed a long
wire antenna, and was best if the wire was taken up to a tree
or suitable high point.
The use of CD player or other analog stereo source gave very pleasing mono sound.

Reformed Healing Audio amp Schematics :-
Healing-reformed-large-radio-sheet1-Nov2011.gif

Healing-reformed-large-radio-sheet2-Nov2011.GIF

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12. Howard BEFORE.

Howard-before-chassis-front-june2011.JPG

The Howard chassis was housed in a very poor quality floor standing timber cabinet which was
in fair condition, and not needing much work. Countless chassis like this one were made
by many Australian or other makers and normally used for a "mantle radio" cabinet of
small size less than a cubic foot, and such radios sat on mantle pieces around the nation.
Today's generation doesn't know what a mantle piece is. In olden days before gas or oil
central heating was used in houses, frozen people used coal or wood fireplaces in their house,
and most people could only afford one fireplace, and one chimney. And only one radio.
And often there was some sort of shelf across the top of the fireplace front, and that's
where the "house radio" lived for 20 years. People were quite socially skilled back in those
old days, and tried to enjoy each other's company and not fight over radio programs or
whose turn it was to fetch more wood or coal for the fire. It wasn't like today where ppl
huddle in bedrooms alone with a screen and the darn Internet and fake friends on
Farcebook.

Inevitably, much larger wooden cabinets were made by eager poor joiners to get a bigger
price from people who bought radios through such cabinet makers. The larger cabinet
was often a 900mm high box with no back, and often was fitted with a 200mm to 300mm
dia speaker instead of the small 100mm to 150mm dia used in mantle sets.
This gave much better "mellow" sound, because while bass response would extend
down to 60Hz instead of only to 150Hz, the treble remained weak and cut off at 2.5kHz
if you were lucky.

The cabinet for the Howard was in fair condition and only the chassis was brought to me
for repair. There was a huge long list of problems and a total
re-build took weeks.
 
13. Howard BEFORE.
Howard-before-chassis-side-june2011.JPG

2 tubes on left were original queer European types with unusual recessed sockets with
4Vac heaters.
Replacements were not available. 2 other tubes had obviously been changed
from Euro to "normal" octal and
a small additional 6.3 Vac transformer added, maybe in
1955. The dial mechanism was the old metal disc and
pinch wheel type which failed to work
properly since about 1960. The dial itself had missing bolts and plastic
was shabby.
There were many things wrong everywhere with everything in this radio chassis.
The chassis is steel, but not plated, and the single coat of paint was powdery and allowing
rust everywhere.

14. Howard BEFORE.

Howard-before-under-chassis-june2011.JPG

The set had been repaired sometime after 2005, and some capacitors were replaced.
The set had given some sound for awhile,
very quiet, lots of distortion, then died.
Ah, the Unknown Stupid Bastard has struck again! ( USB ) All the big problems with
so many things had not been fixed.


15. Howard, AFTER.

Howard5-after-front-chassis+speaker.jpg

The chassis looked better
with set turned on than the photo shows. The whole dial assembly
was re-engineered to have a dial cord and drum tuning. Magic eye tuning
now works.
The old 10" speaker and its output transformer were beyond repair, and replaced with a
10" hi-fi speaker
I had "laying around". To increase the speaker bandwidth from the original
2.5kHz, a 2.5" dome tweeter was fixed on aluminium
straps bolted to edges of the 10" basket.
The 1995 10" speaker had the same overall size and bolt hole spacing as the original from
1945, so the owner would have no trouble re-installing the speaker without cutting an extra
hole in the cabinet front for a tweeter. Thus the speaker was able to
reproduce high frequency
sound from CD or other source from rear RCA terminals.

Bass from such a speaker mounted in a large floor standing cabinet without any back extends
down to about 60Hz
and usually quite pleasing for most music.
 

16. Howard AFTER.

Howard4-after-rear-chassis+speaker.jpg

After stripping the whole steel chassis bare it was sanded well and repainted with oil based paint,
a pleasant pale green-grey. The chassis top has an L shaped piece of flat colourbond sheet metal
siliconed and pop riveted to the painted chassis to hide all old tube socket holes. The type 80
rectifier tube was replaced with silicon diodes - normal practice for me. The EL34 on left is
used as a triode for 5 good watts to power the new speaker through a new output transformer at
bottom centre.
I wound this OPT. The original audio output tube might have made 2 watts,
OK for the old speaker when it was new, but the new speaker needs more power.
I also fitted a new power transformer. Other new replacement tubes were 6AN7 mixer,
hidden from view at far top right,
then 6N8 IF amp, AF 12AU7 detector, 12AU7 AF pre-amp
and tone control, 12AX7
AF amp input/driver for EL34.

17. Howard, AFTER.

Howard3-after-under-chassis.jpg

Under the chassis is completely rewired with my own unique circuit. It has more than
twice the number of parts, but all are needed to get the quality Mr Howard left out
back in 1938 because it may have been Too Hard. 
Sound quality is now fabulous!

18. Howard, AFTER.

Howard6-after-under-chassis.jpg

Another under-chassis view. The red antenna terminal for a long wire antenna is good for short
wave reception. 

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TREVOR'S RADIO. I don't have any BEFORE pictures for the next radio set which had no brand name
anywhere on the
chassis or its floor standing cabinet which was yet another low grade type.

The chassis was a fair old mess, and all required a total re-build with better circuit.
An enormous number of hours were spent, as usual. 


19. Trevor's radio chassis AFTER.

Trevor-unknown-brand-dial-front-june2011.jpg

There is now a long ferrite rod for local AM stations, and wires are shielded where possible, even with
a brass shield around the
coil on the rod. Such tight shields are kept 2mm away from coil, and have a
gap so they do not form a shorted turn, but act to shield the coil from electrostatic pick up, but while
allowing the magnetic portion of electro-magnetic radio wave to be picked up without so much noise
from modern devices and fluorescent lamps.  Chassis was fully re-painted, timber block used for ferrite
rod support, dial mechanism re-made. Black control shaft at front is for switching to CD or other source.

20. Trevor's radio chassis AFTER.

Trevor-unknown-brand-rear-chassis-june2011.jpg

The chassis rear shows new mains cable and mains fuse. I always use a 3 wire mains cable and always
connect the chassis
to Earth via green-yellow wire. External sound source such as CD player can be
plugged in at the RCA terminals.
I would guess this radio chassis was originally bought by a late1930s
furniture maker who could sell his cabinet work with the
radio inside and get more income.
The floor standing cabinet for this radio chassis was of minimal size, with cheap plywood stained

dark, and with a small round port hole for the dial. So such a radio could never be a high value
collector's item. But it performs so much better than many better looking floor stander radios held by
collectors.
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ADRIAN'S OCEANIC.
This chassis had a nice big timber floor standing cabinet which did not need any work,
except that
the cheap pink cloth used in front of the speaker looked quite odd. The owner wanted it to stay that

way, so it was. The chassis was a rusted mess, needing weeks of work totally re-building it all.

21. Oceanic, After.

Oceanic-front-chassis2-Feb2011.jpg

The nice big dial is some sort of fragile early plastic and the translucent paint on the rear of plastic
had been touched up by someone badly and any attempt to make it look better at night would have
ruined it, so all I could do was clean and re-assemble it all and place metal clips to hold the warped plastic to its
steel frame. Clips remain hidden when chassis is in cabinet. Chassis was sanded clean inside and out and
given a coat of of "crackle tone" paint.
 
22 Oceanic, AFTER.
oceanic-chassis-rear.JPG

The set has 6J8 mixer, 6U7 IF amp, 6SN7 AF detector, 6J7 audio driver tube, and EL34 output tube in
triode mode I added a ferrite rod antenna for local AM and the red terminal at LH side is for a SW
long wire antenna. Mains transformer was removed, varnished, replaced, and painted black.


23 Oceanic AFTER.
Oceanic-under-chassis2-Feb2011.jpg

The circuit was completely re-designed and re-wired and included one extra switch added to allow
any modern stereo source signal such as from a CD player, cassette, or phono signal if amplified to
line levels.
Much old radio wiring was done using cloth covered rubber insulated stranded wire and
the insulation disintegrates and there is risk of
short circuits and damaged parts in future. Therefore
PVC insulated wire was used for re-wiring.

The original set was made sometime between 1939 and 1950.
It was used in a large timber floor standing cabinet, and its sound quality would have always been
dreadful, but now it performs beautifully.

______________________________________________________________________________

Other miscellaneous AM radio schematics :-
AMtuner-ECH35-6B8-12AT7-July2004.jpg

CF+AMgeDiodeDetector+CF600w317h.jpg

Revised-Kriesler-Rgram-2004.jpg

SuperhetTube-kitchen-2012.gif

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The range of 10 AM radio stations
which some of my customers listen to in Canberra :-

My irrational horrible scores out of 10 for listenability factor.....

666 kHz, Triple 6 ABC Canberra.  Local content, rather boring, parochial, too much sport,
too much old fart chat about flippant issues. 4/10

846 kHz , ABC Radio NationalABC  Many interesting discussion programs, some world music.
It is worth having a good AM radio for this station alone. 10/10

1008 kHz 2KY – Racing narrow-cast. I don't bet on horses. BORING! horse racing, for which
hi-fi is not needed. -1/10

1053 kHz,  2CACapital Radio Network   Boring repeated replay of a small number of old hit records,
boring advertising. 1/10

1125 kHz Radio 1RPHRadio Print Handicapped Network.
Good to listen to news papers being read, some book reads, dramas, announcers have foggy old voices
and cater for mainly older people with impaired senses who have fond memories of the heyday of radio
between 1935 and 1955, especially including WW2. I have enough compassion for other less well
off than myself to give it a high score, 9/10. There is little advertizing, and although signal is only 300Watts
at transmitter, sound quality is good like ABC Radio National, because RPH caters for those who cannot
read, so a radio gives them their world.

1206 kHz, 2CC – Capital Radio Network  Boring repeated replay of a small number of old hit records.
Red-neck talk back, unintelligent BS most days, advertising. 1/10

1323 kHz, 
STAR Country Canberra Country music, no need for hi-fi. Not my scene to listen to crap songs
about achy breaky hearts and being lonesome by Oz singers with false US accents. 1/10

1440 kHz 1SBSSBS Radio Multicultural. Mainly foreign language broadcasts with small music content.
Excellent for those multicultural type who enjoy music with there own languages 8/10


1620 kHz
Rete Italia – Italian Radio – Sth Canberra. Italian language broadcast 5/10
1629 kHz Rete Italia – Italian Radio – Nth Canberra. Italian language broadcast 5/10 Issa notta too badda.
Summa time they havva de Tarantella, we canna be 'appy.


I find I like ABC Radio National during breakfast, lunch, dinner, and during coffee breaks. 

But not all ABC talk subjects interest me and a quick tune along the band reveals nothing anywhere worth
a listen so I will then switch to ABC Classic FM 102.3Mhz, or the news station on 103.9Mhz.

My own AM kitchen radio which I built from scratch in 1999 does not pick up FM. But I have a generic old
Pioneer AM-FM tuner from about 1975 sitting on top of the timber tube radio cabinet, about 450mm wide,
250mm high, and 250 front to back. The radio speaker is in a box 800mm high, 450mm wide, 280mm deep
and I have a Rola Deluxe 300mm dia speaker made in 1953. It does between 45Hz and 4kHz, and a 25mm
Foster dome tweeter does above 4kHz. The box is nicely ported for bass reflex. The radio audio amplifier
has 12AX7 driver plus EL84 in SE triode. Because the speaker is so sensitive, little power is needed for
thundering levels of marvelous plate rattling bass, while treble goes to 10kHz with AM because of how the
IF amp stage is configured with variable IFT coupling.

Sometimes nothing is interesting on radio, so I hit the off button. But most days radio is an important source
of music
and info, and I'd have a much poorer life without radio broadcasting. Without broadcasting, you have to
spend time searching for interesting media content elsewhere, and radio allows highly trained people to do
your searching for you, and with music they will often make far better choices than you or me.

________________________________________________________________________________________

Some customers I've had wanted their old equipment fully restored to its original condition
without changes
to the original appearance of perhaps 70 years ago.
Much ancient electronic equipment comes to me in a
terribly unsafe condition.
I will always try to fit modern safe mains wiring and a fuse so that ancient
equipment won't give you a shock,
electrocute your cat or burn down your house, so the mains
cabling may change slightly.


Full restoration is more expensive than providing the minimal repair of the equipment to make it work.

Restoring the appearance may cost much more than the electronic restoration.

I know furniture restoration tradesmen who can do french polishing and veneer repairs.
Their cost usually exceeds mine for any large mantle radio or larger floor standing radio or radio-gram.

Modern polyurethane finishes are not much cheaper but I am well skilled at this, and cheaper than
the specialists.

Polyurethane varnish is more rugged than french polish shellac.

For any given amplifier, pair of speakers or old radio, there may be a need to replace any old parts
including switches, mains cabling, volume & tone controls, dial tuning assemblies, electrolytic and
paper+foil capacitors, resistors, tube sockets, tubes etc which may threaten the the future reliability
of the item or become dangerous. The repair has to include preventative work to ensure a happy
future. So when I repair an old 1950 tube amp or radio, I don't just replace one little part, leaving
many others which will fail sooner rather than later.
Usually many parts need replacing to get low noise and low distortion giving good performance
of the unit to meet modern expectations of sound quality and reliability.

I am well skilled at designing amps and radios to give better-than-original performance but it
does take a lot of time, and any time you contact me I am likely to have many months of work
ahead of me.

Old radios, and radiograms have been a small part of my work, but much care is taken to ensure
such old items benefit from restoration for future generations to enjoy.
__________________________________________________________________________________

Canberra's FM radio stations. This time I won't be an old curmudgeon and award points out of 10.

87.6 MHz Raw FM – Dance/Urban
87.8 MHz
Cue FM – Student Narrow-cast

88.0 MHz Radio Austral – Spanish narrow-cast
88.7 MHz ACTTAB Radio – Racing radio
89.5 MHz Valley FM – Community
91.1 MHz CMS Radio – Multicultural Radio
91.9 MHz 1WAY FM – Canberra Christian Radio Limited (with 94.3 MHz Tuggeranong repeater)
92.7 MHz ArtSound FM – Music and arts (with 90.3 MHz Tuggeranong repeater)
96.7 MHz QBN FM – Community radio
97.5 MHz Hot Country Radio
98.3 MHz 2XXfm – Community radio
101.5 MHz Triple JABC (with 95.9 MHz Tuggeranong repeater)
102.3 MHz ABC Classic FMABC (with 99.1 MHz Tuggeranong repeater)
103.9 MHz ABC NewsRadioABC (with 99.9 MHz Tuggeranong repeater)
104.7 MHz 104.7Southern Cross Austereo/ARN (with 100.7 MHz Tuggeranong repeater)
105.5 MHz SBS Radio – Multicultural
106.3 MHz Mix 106.3Southern Cross Austereo/ARN (with 107.1 MHz Tuggeranong repeater)
DAB+
SBS Chill
SBS PopAsia
Hot Country – Capital Radio Network
My Canberra Digital – Capital Radio Network
RadarSouthern Cross Austereo
Mix 106.3 Plus – ARN


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