Hi there, my name is Patrick Turner and I have had a small audio electronics
business located in Canberra, Australia.
Last update to this site 10 May 2013.
I officially "retired" last August 2012
and I no longer offer repair service to any new customers.
I am slowly working through a list of work for old customers which may be completed
by sometime in 2014.
continue to be available to offer technical advice to DIY re
about vacuum tube
amplifiers, if their own efforts mean that my time is not wasted.
The website now
mainly exists mainly to promote knowledge about good domestic
hi-fi audio systems using vacuum tubes, with a little bit of solid state.
Recently added web pages include :-
Speaker Matching Transformers. About using better impedance matching for amps.
Loudspeakers 5. About handcrafted bamboo ply boxes with NOS Tannoy drivers.
Solid state 5. About hybrid amps using tube input/drivers, mosfet outputs.
THD measurement. About the gear needed for THD testing of amplifiers.
My email address is shown in the
.gif image below and you will need to type this into
your emailing program to contact me. Consequent emails will then work automatically
in future when you click 'reply'.
6241 2760.......10am to 7pm
EASTERN AUSTRALIAN TIME!!!!
I do NOT own a mobile phone, or credit card.
I have recently up-dated my page about my battle with cancer.
HAND CRAFTED PRODUCT.
From 1996 to 2012 I created a number of hand-crafted amplifiers and
loudspeakers for very happy customers. I have also re-engineered a number of
amplifiers and speakers and the scope of work is listed in the following :-
POWER AMPLIFIERS. Many pages about tube
amplifiers, 4Watts to 300Watts.
ALSO 5 pages on solid state amplifiers including latest page on hybrid class A amps
with class A mosfets driven with vacuum tube input stages.
FUTURE POWER AMPLIFIERS?
1 page on chassis and metal work for possible future amps.
PRE-AMPLIFIERS. 4 pages for tube line level and phono preamps.
LOUDSPEAKERS. Several educational pages about full range premium quality
stereo loudspeakers and pages about DIY speakers and testing speaker performances.
RE-ENGINEERED AMPLIFIERS. 5 Pages on what might be done with old amps
such as Quad, Leak, Dynaco, JBL amps, Jadis SET, all done to make them sing to
meet 2013 expectations, and stop smoke production.
RADIO RE-ENGINEERING. A page with pictures of re-engineered radios, showing
what really needs to be done to make the old junk sound good enough for serious
listening in 2013. I don't have time for any more radio repairs for the foreseeable
CUSTOM MADE AMPLIFIERS.
General notes about 300 Watt tubed monobloc amps.
FOR SALE, March 2011.
OUTPUT TRANSFORMERS FOR SALE. 58 types of OPTs for diyers and others.
OUTPUT TRANSFORMER INFORMATION. About OPT for sale, use, choice.
OUTPUT TRANSFORMER ANALYSIS. Properties of OPT for sale.
POWER TRANSFORMERS FOR SALE. 103 types power trans for diyers or others.
POWER TRANSFORMER INFORMATION. Properties of PT, choice, conditions of sale.
CHOKES FOR SALE. A page with some new and old chokes for sale.
MISCELLANEOUS FOR SALE. A small number of OJ items = Old Junk.
Updated June 2012. I have a few old solid state amps, all need repairs.
TUBES FOR SALE, 2011.
I have small stocks of Russian made amplifier output tubes and input tubes and a
collection of tubes for old radios. These are usually supplied where they
are really needed for a new amp project or for a repair or re-engineering job.
EDUCATIONAL AND DIY.
Many pages about technical issues with hi-fi, vacuum tubes and many
not so basic issues on how to make tube amps.
Additional pages being added constantly so some old links will not work.
Popular pages on PP and SE OPT Calculations have been entirely revised
Design of pre-amps, power amps, 4 Watts to 1,000 Watts, basic electronics.
1 page about good audio for the home, 3 pages on basic tube operation,
8 pages on load matching to beam tetrodes and triodes,
8 pages on tube amp power supplies, output and power transformers and chokes,
1 page on fully tubed AM/FM tuner with MPX decoder,
2 pages with 16 miscellaneous schematics.
PATRICK'S OTHER CONCERNS,
last update, 10 May 2013.
This is a bit of a BLOG, about recent health NON-improvement, use of a bicycle,
prostate cancer treatment effectiveness, uretic stents, and many personal opinions and
views which may make some people froth at the mouth with rage, be sick into a bucket,
and/or agree completely, or, not care a bit about. :-)
My latest PSA tests show that optimism
may be quite a silly emotion to have,
and it would be better for me to find a way to co-exist with my condition and unknown
destiny rather than to wish for a magic cure. Any intelligent polite comments are welcomed
from anyone anywhere.
I've never been afraid of the world or
any of its people after 12 years of being online with a very
public presence and using my own name. I try to always be fair and firm when dealing with
anyone, and have not had much trouble by acting honestly.
I can't fully understand why the Internet offers extremely good opportunities for everyone to
write letters to each other, but yet they barely manage Twitter. The Internet offers many
opportunities, but then keeps ppl apart once they begin to fear being involved, or not getting
something for free. And how do I take anyone seriously if they do not have a website which
explains who and what they are?
It seems to me that despite the
Internet, humans are not much happier than they were in 1973,
or 1993, Human nature intervenes with trying to relate to others.
Most of the website was prepared before
New pages have been added and/or improved after August 2008.
Download the whole site now to replace
older versions. About 39MB.
Postal address, 1 Adams Pl, Watson, ACT 2602 Australia.