AMPLIFIER CHASSIS FOR SALE.

March 2015.

I have a many amplifier chassis and metalwork parts which I will never use.
They were well made by CANFAB in 2003, http://www.canfab.com.au/

The quality is equal to anything made by hi-end hi-fi amp makers anywhere
in the world.

PRICE?
If you are thinking of building a pair of monobloc tube power amps you
may email me for a price for the metalwork AND for the freight cost to
your postcode.

The chassis were meant to be used for 4 different types of of monobloc amps
which I thought I may have to supply to customers. But nobody wanted the
possible amps and they all demanded something different or "more unique."
The parts for 22 power amp monobloc chassis have been stored under a
bench for the last 12 years.

Each monobloc amp includes parts :-
1 pc main chassis with holes for tubes, ventilation.
2 pcs transformer pot,
1 pc perforated metal tube cover,
1 pc perforated metal bottom cover.


Below are some pictures of unpainted chassis ready to be filled with parts
for future amplifiers. There are enough chassis for :-

2 monobloc SE amps, each with 1 x 13E1, 7big socket, 2 input/driver tubes.

2 monobloc SE/PP amps, each with 2 x 13E1, 7big socket. 3 input/driver tubes.

4 monobloc SE/PP amps, each with 2 x 6550/KT90KT88/EL34/6L6GC/300B.

4 monobloc SE/PP amps, each with 4 x 6550/KT90/KT88/KT120/EL34/6L6GC.

All dimensions = overall size in millimetres. To convert to inches divide by 25.4.

The chassis are 1.6mm thick zinc plated steel sheet.
Transformer cases and
perforated cages over tubes are 1.2mm zinc plated
steel sheet.

All external corners are welded and ground smooth to give an excellent finish for
powder coating.


Type no 1x13EI.
chassis 1x 13E1
This one is for 1 x 13EI or other single tube which may fit.
Driver and input tube = 2 x octal or 9 pin miniature tubes.
Size of chassis = 360L x 210W x 55H
Size of transformer box = 125L x 125W x 140H, allows 70S x 44T E&I core.
Size of cage =  204L x  96W x 140H

Type no 2x13EI.
chassis for 2 x          13EI.
This one is for 2 x 13EI output tubes or other such as 300B etc.
Driver tube and input = 3 x mini nine pin.
Size of chassis = 400L x 230W x 55H.
Size of transformer box = 125L x 125W x 140H,
allows 70S x 44T E&I core.
Size of cage =  224L x  136W x 140H.
 

Type no 2xOctal.
chassis for 2 x
          octal, monobloc.
This one is for 2 x Octal output tubes.
Driver tube and input = 2 x miniature nine pin, or can be enlarged for octal.
Size of chassis = 360L x 210W x 55H.
Size of transformer box = 125L x 125W x 140H,
allows 70S x 44T E&I core.
Size of cage =  204L x  96W x 140H.

Type no 4xOctal.
chassis for 4 x
          octal output tubes.
This one is for 4 x Octal output tubes. Driver tube and input = 3 x mini nine pin.
Size of chassis = 400L x 230W x 55H.
Size of transformer box = 125L x 125W x 140H,
allows 70S x 44T E&I core.
Size of cage =  224L x  136W x 140H.

Typical details of chassis cut-outs, 2xOctal, 4xOctal chassis :-
2 + 4 octal
          chassis sets.
The large slots where transformers are mounted allow for the primary and
secondary terminals to be mounted in fibreglass boards to project into the
sub-chassis area for easy wiring to tubes and for easy strapping of
secondary windings to suit different speaker loads.
The E&I laminations are vertically mounted and the clamp yokes bolt to
the chassis through each hole near each end of the the chassis slots.
The laminations are kept slightly clear of the steel sheet chassis material.

Slots around the octal socket holes allow for cooling air flow up around each
output tube but not allowing objects less than 3mm dimension to fall
through the slots.

Not shown are the 2mm steel plate transformer yokes and
steel bottom plates with a large area perforated for ventilation.

1 and 2 x 13EI chassis :-
1 and 2 x 13EI
          chassis sets.
The large slots where transformers are mounted allow for the primary and
secondary terminals to be mounted in fibreglass boards to project into the
sub-chassis area for easy wiring to tubes and for easy strapping of
secondary windings to suit different speaker loads.
The E&I laminations are vertically mounted and the clamp yokes bolt to
the chassis through each hole near each end of the the chassis slots.
The laminations are kept slightly clear of the steel sheet chassis material.
 
The large 75mm dia holes for output tubes allow for small metal plate
about 80mm x 80mm to be mounted say 25mm below the chassis top
and which has a hole suitable hold a 7big socket for 13E1, or other large
output tube, perhaps 6C33C, GM70, or KT120/150.
The small sub-chassis plate allows a generous air flow up around a large
output tube.
 
Not shown are the 2mm steel plate transformer yokes,
steel bottom plates with  a large area perforated for ventilation
and sub-chassis plates for mounting 13E1 sockets.

Chassis for preamps.
chassis for
          preamps.
The preamp chassis are without any holes.
A small number are available.

The all-steel metalwork would need a considerable number of additional
holes to be drilled tapped for M3 or M4 c/s machine screws.
For mass production, powder coating is normally done to multiple chassis
after ALL holes and threads have been cut and all hole edges have been
de-burred and all oil cleaned off, and surfaces sanded again by hand.

But for DIYers who want to make only 2 amps, they may have chassis
powder coated before the additional holes and threads are cut.
This involves more care with c/s holes.

Painted or powder coated chassis should be covered in 2+ layers of
masking tape during assembly and work on bench.


Mistakes with hole positions or hole sizes or blemishes cannot easily be
repaired.

Radical changes to design as you progress cannot be accommodated.

DIY hobbyists will make terrible mistakes because of their lack of experience.

I was a very patient and thoughtful craftsman who took time to set out the hole
drilling so that the prototype amps I made became the finished amp which I sold.

The chassis have room for any typical amp schematic I have at this website.
The chassis were not powder coated by CANFAB because not everyone
wanted black amps. Well done powder coating is cheaper and harder than
any automotive spray paint or applied by asian amp makers.

While chrome plating is possible, I don't like it. Seeing samples of old chrome
plated amplifiers ( EAR509 ) led me to believe chrome is prone to peeling,
cracking and blemishes.

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