Traynor YBA1 conversion

[talbany]

Here is an 90s style HRM with Skyliner I built using a Traynor YBA1a chassis as well as a KILLER!! Hammond OPT Pete Traynor used. I used GE 6550's It also has the built in Dumleator. We designed the board ourselves. and is Pretty quiet. I am working on clips of the amp and will post them when I get a chance. Also I want to thank everyone here for there help while I came up with my version of a Dumble OD special amp You guys should try 6550's in these amps WOW!!!!

[talbany]

One more shot

[Bob-I]

Very nice. Is that a PCB? Very cool!!

[talbany]

Yeah I tried to keep the etches down to a minimum I didn't really notice that much of a differance in tone at least nothing negative when we made the transition from turrett to PCB the PCB amps are without a doubt quietier. Sorry if I offended the purest's. by posting a PCB Dumble style amp. 10x easier to build

[talbany]

Sorry Bob Thank you for the compliment. I need to take the amp to Scott's and let him do some clips.

[tele_player]

Is is a single-sided board? Can any parts be replaced without removing the board?

[talbany]

Yeah we just had fairly large eyelet holes made in the board and as long as you keep your Iron tame you can take parts on and off fairly easily. All the parts are mounted on top.
All of the power supply and bias supply etches were on one side and signal on the other. We tried to keep the etches as thick as possible especially for signal and also used a high silver content on them as well pretty pricey though well worth it in the long run if you build many of these amps. But that is just my worthless opinion.

[Bob-I]

I like the idea of PCB. I wanted to make upa PCB Dumble a long time ago but my inexperience with designing PCB's got in the way. It would be very cool to duplicate these with PCBExpress.

[tele_player]

And then we can switch to tiny pots, on a PCB, and mount the sockets and jacks on a board, and use ribbon cables to tie it all together.

Voila, Hot Rod Deluxe.

Just kidding - I think PCBs make sense, in moderation.

[talbany]

Yeah I would never mount the tube sockets and pots on the board or wave solder either. We did this on Pad to Pad. Right now we are prototypeing a 3 channel design. The first is a straight up Showman Clean Channel. The 2nd will be a blend channel so you can blend between a clean channel and overdrive like ganging the channels of old marshall. The third is straight overdrive. The clean channel and overdrive will be 2 discrete channels. Speaking of mounting tube sokets and pots to the board. I had a Demeter TGA-2 that had all that had all that stuff mounted to the board.

[Funkalicousgroove]

there is NOTHING wrong with PCB amps, and I think you did a beautiful job!! Kudos!!

BTW, I know that some of the last ODS amps built by the big guy were 100% PCB.

I KNOW FOR A FACT that the SSS amps are PCB as well.

[talbany]

Thanks Funk. I think with your power supply and fet boards and my preamp boards you could cut down on build times greatly and still have an excellant sounding amp. I just think mounting tube sockets on the board is a bit much. Again just my worthless opinion.

[jelle]

Very Nice Amp!

I have done a HRM with 6550's and I felt the need to adjust the 220k bias dividers to the 82k that the marshalls used because the 6550's did not like the 220k's too much. Have you adapted the PI as well?

I agree about the 6550's They sound very nice with these ckt's.

What is that thing in the add tube socket? Is that a rectifier tube or a cap?

Jelle

Edit: typo

[Funkalicousgroove]

As far as mounting the sockets to the PCB, if you have a hole inthe PCB above the socket for heat to dissipate and not heat up your traces it should be fine. It's really power tubes that you want off the boards.

[talbany]

Jelle
No there are 220Ks in there. does the 82ks help with the frequency responce ? That extra tube is an OC3 Regulator tube same as what's in a Hammond organ it drops the voltage on the screens by 100 Volts as well as regulates it. It requires a touch more filtering but you get a sweet chime out of it like an ultralinear tap but without the harsh breakup an ultralinear. It doesn't effect the sound dramitically it's a subtle thing.