As she came in 1972 Fender Twin with master volume but not Ultra Linear
Tube Layout
Original RCA output tubes.. all test good but not well matched
Pyle Speakers.. original and looks like original cones..
Final Assemby by Mr J. Shults
Chassis out assembled by Mr Richard Hand.on the 11th March 1972
All components original no on has touched anything since 1972!
She will have all the electrolytics replaced before I fire her up
Speakers out while cab is reparied
Love the RCA tubes!
Front baffle a little cracked. Will reinforce this (not such a simple job to replace as this baffle is glued in..
Nice Fender Logo with a tail!
Cab empty cleaned up and screw holes filled (all a bit stripped.
Cleaning up the sliverface
Pyles back in but turned out to be a bit flabbly.. and damaged around the edges.. really need a recone
Cab cleaned up and Pyle speakers back in
Caps beady to be replaced…
new caps fitted
Resistors taken to AD763 spec
Before Blackfacing
With the PI modded to blackface specs
One Plyel was seriously flabby.. so replaced with an Eminence Legend,.. (another on order)
Reverb tank being checked out,, no issues!
Testing out on the bench and sounding sweet!
Two legends now fitted
Reverb tank back in
Sounding good just needs the grill
New Gril cloth on and logo attached
Love the longtail on these early Silverfaces
All sounding good and footswitch repaired
decided to change the tone stack on the normal channel to a Tweed Bassman TOnestack (but liike an early Marshall tone stacl
2×0.022uF caps in place
Also was a bit frustrated about the poorly matched, but lovely, old tubes in her so modded the bias to be able to individually bias each tube, I needed to add a couple more 0.1uF coupling caps for this. It was worth the effort!
Chassis just before putting back in again (I did after this shorten a few leads but forgot to photo the result)
note the old master volume wires used for the variable negative feedback.
Put the spare 10K pot (from the Normal Channel Tone Stack) in the master volume slot as a NFB control or “Soul” control
AB box I use for channel switching
Soul control really works well withthe NFB turned down she breaks up really nicely at not to crazy volume and tightens up as the control increases feedback. Makes the amp really flexible!
Workout with some of my fave pedals!
Fantastic 1972 Silverface Twin Reverb came in looking a bit sorry for itself with a metal grill. I Serviced and modified her and now will nor let her go.. my own No 1 Amp: Full recap of all electrolytics Circuit modded to AB763 specs (Blackface) Normal Channel Modded to a Tweed Bassman tone stack (more gain and not so much mid scoop) Reverb and Vibrato added to the Normal Channel Original RCA tubes kept but bias modified to be able to adjust bias on each tube individually (not a matched set at all) Master Volume Removed and a “Soul” Control added (so you can adjust negative feedback) adjusts the whole attitude of the amp 2x Eminence Legend 1258 speakers replaced the too knackered Pyle Speakers Most of the preamp tubes needed replacing (they gave out or became noisy during testing) New grill cloth put on 2 more handles added to make the amp more “portable”