Got this 1979 Peavey Deuce VT in as a none worker. Stripped her down and fixed a few issues. This amp has a solid state front end and a Tube output stage 4x6L6GC tubes. Fixed the following: – None Working on switch – 3 dead tubes – One pot frozen – Leaky coupling caps in the PI circuit – Bias too cold.. added a variable bias control and 4 x 1 Ohm current sense resistors. Lovely fingerjointed cab that I decided to strip to natural. Great sounding amp! A couple of mods also to the circuit. A 47nF cap added across the 1K to ground in the Negative Feedback potential divider to give some more presence and low pass filtering in the preamps reduced (put in to smooth distortion) this gives her a much brighter sound. My Number 1 amp now.

As she came in dusty and dead…

Tolex torn hear and there..

 

Original Peavey output tibes.. only one left working..

Checking her on the bench a number of issues found

 

PCB has places for multiple fuses that have not been installed (a bit overkill IMHO)

 

This switch did not switch on…

1 ohm current sense resistors added to help set the bias (not so easy to do on PCB style tube mounts but possible.

Cab opened up.. Tolex pretty torn up in places..

 

OK decided the Tolex had to go..

Stripped cabinet with great finger joints

 

nice!

all cleaned.. gave me the idea to leave the finish natural

PCB board removed to repair one of the pots and replace the output coupling caps from the PI circuit as one had gone leaky.. causing 2 of the tubes to redplate.. probably what killed the other tubes…

 

One pot needed cleaning out.. it was very stiff and crackly now working well these are great pots!

Variable bias added to optimise output stage tone

Chassis on the bench for testing..

 

Bottom of case a bit battered but looking good now oiled and waxed!

Quad of Shuguang 6L6GC tubes sounding good in there and very closely matched!

 

Power transformer..

Output transformer

 

All back together

 

Love the coloured pot shafts!

 

Lovely Finger Joints

The finsih worked out really well IMHO

 

All finished and sounding good!

Cab oiled and waxed