Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: plexi50 on August 18, 2012, 07:45:00 pm
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I picked this 1968 Traynor YSR1 this morning. It came with the matching 4 10 cab. I have already been through the amp and it is has great tone. I havent tried the cab out yet but did measure 8 ohm impedance. The amp has extra virgin olive amp oil in the tone. The pics show the tubes that have probably never been touched since installed. All test 100% including the Mullard 6CA7 power tubes. Metal Traynor logos on both amp cab and YF 410 cab. I have thanked the lord again for such a nice find. The price? :worthy1: :worthy1: :worthy1: :worthy1: :worthy1: You wouldnt believe me and you would hate me even more
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Front and rear of 4 10 cab. Grille cloth and cab not torn
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Man look at the size of that iron! Wow.
Very nice find. Looks like it's in great shape too. Mullard EL34's. Nice.
Brad :icon_biggrin:
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I gotta know how much you paid.
Dave
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Yeah the iron on these old Traynors are very nice. The faceplate is so clean. I put those white chicken head knobs on because a few of the original knobs were missing. Dont know if they are going to stay or not. Cant wait to plug into the 4 10 cab tommorrow and hear what it sounds like
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The preamp tubes look like relabeled Mullards to me. Look to see if there are any etched codes on the lower portion of the envelope, below the Rogers labels, near the pins.
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It's in incredibly good shape. Great find!
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The preamp tubes look like relabeled Mullards to me. Look to see if there are any etched codes on the lower portion of the envelope, below the Rogers labels, near the pins.
There are numbers near the pins and GT.Britan as well. My camera is failing a little these days so it getting harder to get good close up pics. On 3rd attempt now
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Your first picture of the preamp tubes shows two rows of markings. The bottom row starts with "B". That indicates Mullard's Blackburn factory.
Congrats!
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Hey, schemo shows bias vary term. :icon_biggrin:
V1 shows 132vdc on plates, V2 shows 146vdc and 215vdc on the PI, which might sound great as is. Don't know if yours is the same? Yours does have a big honkin choke and a verb driver OT. There's a 33K dropping R in the B+ feeding them. It would be easy to play with that if a little fine tuning is needed?
I was working at a couple music stores in my area 10 years back and at 1 of them the owner took a Traynor bass amp, 2 x EL34's with 2 x 15 cab in on a trade. He had me re-tube it and we plugged a couple guitars into it and that thing sounded great. He wouldn't let me re-cap it though.
Brad :icon_biggrin:
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Thanks HBP. Im keeping this setup. I just played for an hour with a freind using the amp and matching cab. The best way for me to describe it is (groovy) The tremelo is way different than the YBA1 and has more of a 60's flavor to it. . The bass end and high end notes of the cab are perfectly balanced
Willabe i checked the 33K r and it is reading 39K. I put a 27K 2 watt in it for now. The voltage of V1 is now closer to 132VDC . Before with 39K i was reading 119V which was a little on the low side. I ordered some 33K mf 2 watt resistors. I dont want to change a thing in this amp except for the 33K keeping it stock
A nice trip back in time. I love it* KEYWORDS: Groovy,Far Out,Happenin,Daddio
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Well far out daddio! :laugh:
YBA1? That's a bass amp, no trem in it. :dontknow:
The B+ on the preamp and PI might be fine just where their at now. It's a tast thing. Some like them lower, maybe a little darker sounding and quicker to distort? Or maybe a little brighter with a little more headroom if they have a higher plate dcv.
Just a thought.
Brad :icon_biggrin:
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that amp looks like it spent most of it's life sitting in a closet.
very nice score.
--DL
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Yeah DummyLoad thats what i have been thinking myself. Theres no way it wouldnt have any tears in the tolex or in the 4 10 cab grill cloth if it had seen any road use. Im pretty certain bt the looks of the preamp tubes that they have never been pulled before i tested them and the power tubes. It looks like a sweet slim brunette (or blonde) sitting here. I really thank the lord everyday for my good fortune and blessings. No Blondes though. Just *amps*
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Willabe i found the correct schemo showing the reverb tranny and choke. The preamp voltages are up around 200 for V1. It's not the most ledgeable schematic either. Wheres Joe Pizzio when you need him?
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That amp is no good! Pack it up and send it to me immediately!
Nice score Plexi!
I have two of my own,being in Canada helps a bit. :)
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I would send it to you but USPS doesnt have a box big enough :laugh:
Man i have to turn a blind eye to the offers some of my customers are throwing at me. They are stoked. I must keep this and slap myself to abandone the idea of making a profit. For me this is a once in a lifetime find as far as a complete Traynor amp/cab setup goes. That wont happen again. Just surreal.
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Willaby i found the correct schemo showing the reverb tranny and choke. The preamp voltages are up around 200 for V1. It's not the most legible schematic either. Wheres Joe Pizzo when you need him?
Cool, I wonder if Sluckey can do his magic again and clean it up and put it in Doug's library?
It's hand written at the top of the schemo that it's an early YSR1. If that's true it's interesting to note that he dropped the plate dcv on V1 from 205dcv to 132 dcv and V2 from 223dcv to 146dcv. Yet your had the lower plate dcv's? In between version? PI on schemo stays very close in both versions, around 215/205dcv on the 2 plates? What does yours measure?
I wonder if he tried different B+ values for V1/V2 and had some players comment on what sounded better? :don't know:
Man i have to turn a blind eye to the offers some of my customers are throwing at me. They are stoked. I must keep this and slap myself to abandon the idea of making a profit. For me this is a once in a lifetime find as far as a complete Traynor amp/cab setup goes. That wont happen again. Just surreal.
Yeah, if you really like it and don't need the $$, why not? You could always sell it later if you need to. Besides it will just make them hunger for it more. :laugh:
Brad :icon_biggrin:
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That amp is no good! Pack it up and send it to me immediately! Nice score Plexi! I have two of my own,being in Canada helps a bit. :)
Well there you go! :laugh:
IIRC, phsyconoodler has said a number of times before that some of the Traynor amps had good sounding speakers and some had not so good sounding speakers?
You like what you have, what are they? Maybe some pics please, with codes?
Maybe he'll weigh in on this and what he's seen as far as plate dcv's on the preamp tubes and what he prefers tone wise?
Phsyconoodler, along with Loose Change, have probable fix/played through more Traynor amps, than any one else here?
IIRC, Tubenit, who has done a lot of experimenting on amp builds, said he found 180dcv to 200dcv what he liked? Now everybody plays different, has a different ear and has a different sonic goal in mind, but still it can make a differance.
Brad :icon_biggrin:
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I just looked again and there's already a YSR1 schemo with choke/verb OT, in Doug's library, and it's a bit cleaner than the 1 you found. It's at the very end of the Traynor list.
Brad :icon_biggrin:
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Thanks Brad. I have been going over all the different YSR1 shematics the past few days and here is what i have.
I have the YSR1B layout in parts completley. But i have the reveb tranny and choke as well. The reverb tranny and choke schemo has V1A & B cathodes being shared by an 820r / 25uf bypass cap where my amp has a split cathode arraingement with 1K on each cathode and no bypass caps. Plus i have a 33k r supply feeding V1 & V2
So i quess it depended on who was building the amp that day and what they wanted to do. We have a few different variations with the reverb tranny and choke. In any case it is a sweet deal of an amp and im happy. I did have to change out (3) ancient cathode caps as they were starting to protrude from the cap can itself. I changed the 33K V1 & V2 supply node that had strayed to 39k for a new metaloxide 33k. I changed the 47k bias resistor that had strayed to 49k with a new 47k metaloxide.
I decided to go with the fender / marshall LTPI values and that has made a nice difference in driving the PI tube. The amp does breakup nicer. I have saved all the parts as usual so if i ever want to put the PI back to stock i can. But i dont ever see wanting to. The EQ and all other parts will remain stock
The cathode caps had to be replaced. The PI was my choice for a little more drive. Who says an amp cant love you back? Now will someone please tell me to put this chassis back in the cab and go play with something else?
Steve would be proud of me* I didnt plexify it. Thankyou/ thankyou. Thankyou very much. Thankyou/