ampage Tube Amps / Music Electronics	For current discussions, please visit Music Electronics Forum.

ampage archive

Vintage threads from the first ten years

previous: Troy Thanks guys! I'll break mine open ... -- 10/20/1999 10:37 PM

Re: Modding a Traynor YBA1

10/21/1999 2:21 AM
dr	Re: Modding a Traynor YBA1 Just to add my 2 dollars... From reading other posts about these amps, it seems like there was slight but continual changes made to the circuit from 66 to 72. Mine is a '67 and has (or had in some cases) SS rectifier, 7027As, 4M vol pots with 100K preamp mix resistors, a 1000pf vol bypass cap. And the power supply differed slightly from the both the '66 schematic and '72 schematic. Filtering is a pair of 40uf-40uf cans, with the standby switch grounding out one end of the rectifier bridge. I 'plexied' mine and have KT66's in it. I got an early 80's traynor slant-top 4x12 cab and filled it with Weber C12B's. I like these speakers very much. Stock, it had monsterous earth shaking tone at volumes of 4 to 5, not unlike 70's marshalls. Not ice-pick, like psycho-bass guy's, but like a 'BTO' sound. I wonder if they recorded with these little monsters? I discovered an unused, clipped 16ohm tap coming out of the output tfmr. I wired it up with the 8 ohm tap to a switch mounted in the ground-switch hole for a speaker impedance switch. dr

10/21/1999 2:21 AM

Re: Modding a Traynor YBA1

Just to add my 2 dollars...

From reading other posts about these amps, it seems like there was slight but continual changes made to the circuit from 66 to 72. Mine is a '67 and has (or had in some cases) SS rectifier, 7027As, 4M vol pots with 100K preamp mix resistors, a 1000pf vol bypass cap. And the power supply differed slightly from the both the '66 schematic and '72 schematic. Filtering is a pair of 40uf-40uf cans, with the standby switch grounding out one end of the rectifier bridge.

I 'plexied' mine and have KT66's in it. I got an early 80's traynor slant-top 4x12 cab and filled it with Weber C12B's. I like these speakers very much.

Stock, it had monsterous earth shaking tone at volumes of 4 to 5, not unlike 70's marshalls. Not ice-pick, like psycho-bass guy's, but like a 'BTO' sound. I wonder if they recorded with these little monsters?

I discovered an unused, clipped 16ohm tap coming out of the output tfmr. I wired it up with the 8 ohm tap to a switch mounted in the ground-switch hole for a speaker impedance switch.

dr

Replies:

peter my understanding, which may... -- 10/21/1999 2:18 PM