Traynorwreck express

[ronh]

I just finished rebuilding a Traynor YGA-1 amp into an express. Using this chassis caused some problems that I had to make adjustments for.
Tranny and tube locations, PS caps and pot locations are different than the express layouts show. One problem was major parasitic oscellations.
So I made the following changes to the layout. V1 uses only half the tube and both halves of V2 are used. This amp is very quiet for such a high gain amp. One problem I still have is a high pitched whine that is controlled by the presence pot. Turn the pot to 0 and the noise goes away. I mounted the 100k feedback resistor on the output jack, lower signal level going to the PI should help with noise. Does anyone have any ideas as to the cause/cure?

This amp sounds great. It is not a express clone due to the output trannys impedance. I measured it at 5k, The only numbers on the tranny is 3K1033. This tranny is not the original tranny for this amp.

This amp is loud, bright in a good way, touch sensitive and dynamic.
I wish my guitar playing skills were a match for this amp!

[Dr-Joned]

Great! Gotta have some porn shots

[Dr-Joned]

Great! Gotta have some porn shots

[ronh]

Here is a shot of the amp. I must say that rebuilding an amp into another type is not the way to go. A clean build is quicker. I had the parasites real bad. But it is a cheap way of doing it.

I thinking of getting an OT with the right impedance. Having gone this far might as well go all the way.

[jjman]

... One problem I still have is a high pitched whine that is controlled by the presence pot. Turn the pot to 0 and the noise goes away. I mounted the 100k feedback resistor on the output jack, lower signal level going to the PI should help with noise. Does anyone have any ideas as to the cause/cure?.......

Sounds like you need to switch the primary leads on the plates of the output tubes. Your negative feedback is probably positive at the moment.

[ronh]

Hi jjman. I tried reverseing the OT primary wires. It made it worse. I moved some of the wiring around in the hope its a layout problem. Just have not had the time to try the amp out yet. Thank you for your idea.

[mojo]

I have a BassMaster I thought about doing this with, but have left it alone. I think you're right - its tough to "circuit bend" an existing amp very far. I may still mod my BassMaster to Plexi specs but I think that is a much more natural mod.