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Wild Bill said:
I've done a couple YSR-1's into "Plexis" and many other Traynor heads as well. It's a straightforward job for a tech. They DO sound cosmic when done!

If you play hard core with low tunings like open C there's a further benefit. Traynor used big ass Hammond output transformers that will easily handle notes lower than standard tuning. A lead head will usually begin to crap out.

I make up a custom faceplate with a computer program and print it out on heavy card stock. Once laminated it looks rather professional and then all the controls are properly labelled. I also add a circuit tweak or two.

However, although you wouldn't be my first customer from London way it is a bit of a drive to Stoney Creek. I'd understand if you kept looking for someone closer.

You can send me a private email if you decide on the job. Wherever you get the job done you're gonna LOVE the result!
Hey Bill, just curious if you change out the shared screen resistor (470 ohm 10W) to a seperate 1K - 5W unit for each power tube? I heard that this makes it more "Marshally" sounding.
 

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Ripper said:
Good mod. It does help the "Marshall" sound. If memory serves me correct Kevin O'Connor recommends this change for a YBA-3 in one of his books. I've used it with great success in conjunction with other tweaks.
Thanks, that must be where I read about it. I have picked up most of Kevin's books over the years.
 

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davetcan said:
Well that went straight over my head :confused-smiley-010

How about you just make it sound good. :food-smiley-004:
sorry for hijacking your thread with the tech question. I used to mess around with Traynor mods, and there are a lot of things that you can tweak to tailor the characteristics of the amp. This can involve anything from changing a couple of components to gutting the amp and rebuilding the entire circuit.

You just need to find a tech that understands your sonic goals and can make the necessary changes to the circuit to make it happen.

Now that Kevin O'connor has moved to Thunder Bay, I don't know any local London guys. May be worth the trip to see Wild Bill as it sounds like he's modded quite a few. I've heard good things about the guys at Songbird Music and Encore Music in Toronto as well.

Scott
 

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davetcan said:
Exactly that. He sometimes adds delay but that's about it. He always records with a miced cab and usually plays pretty damn loud :D Oh yeah he also uses an attenuator occasionally.
definitely some delay on there. Do you know what kind of speaker cab he was using?
 

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Telemark said:
Where do I start? I have a YBA project, and have gathered a few links. I am a tehnical sort but have not tackled a tube amp before. I undertand the Hi voltage concern.

Where is the best place to buy parts for these amps, pots, caps etc.

What is the "plexi mod"

And what should I do about the funky power cord arrangement? I was thinking about a modern style removable plug. but so far have just soldered in a rescued cord from something else that died.:redface:

Thanks for posting that link Dave.

Mark
The "Plexi" mod is basically changing selected parts values to match your favorite 60's Marshall SuperLead (or Super Bass) circuit. Most folks change out the 4 Meg volume pots for 1 Meg, adjust values in the tone stack, change some cathode bypass cap values, etc. I used to add a bias pot and change out the filter caps in most cases as well.

I would suggest that you not mess around with the grounding scheme on your first project since you can really open up a can of worms there.

You should be able to make a cut-out for a power socket at the back, assuming that there is enough room there.

You can get the parts from a lot of sources these days, such as Antique Electronic Supply, Angela Instruments, and many others.

Good luck...

Scott
 
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