Vostre Roy
Member
New Canadian Bass Head Day Eh!
So, I am not totally done with my Weber. Thing is, I need to understand how to read schematics a little more, right now the amp is not working and I can't figure whats wrong. I need more knowledge, so I put the Weber on hold and did a quick find about another amp to practice myself. Since I was lacking a bass head, I decided to aim for one. After a quick search, I found the Traynor bass head to be fitting my request, all tube, fairly speced and quite easy to find in Canada. Another plus, those heads got lot of space to work in, and the flipped-over electronic construction mades it even more of an dream to work with.
So long story short, I tell my friend with who I play in my second project that I'm looking specifically for a Traynor YBA-1 Bassmaster head, he reply by this: "Oh, a bassmaster right? Yeah, I got one of those". So he really did had the exact head I was looking for, after some harassment he decided to sell it to me. Funny fact: He's also the former owner of the Big B cab I also own. So its a stack back together now!
Specs:
Traynor YBA-1 "Bassmaster"
Year made: Somewhere between 1966 and 1968
45 watt @ 8 ohm output
2 separate channel with their own volume pots (high/low input for both)
2x EL34 power tubes
3x 12AX7 preamp tubes
I haven't compared yet the amp to the original schematics, but I can tell for sure that some mods have been done.
- The originals RCA 7027A tubes have been replaced by EL34, dunno if the bias has been changed.
- One of the channel's input jacks has been removed and disconnected.
- One of the voume pots has a capacitor on it, and the other dont. They are supposed to be the exact same, I'll look more into this.
- The power chord has been upgraded with a three legged chord and the ground lift has been removed.
- I suspect that every pots has been changed, the original volume pots where 4M and they are now 470k ones, and all pots look about the same age.
- I can see that some capacitors has been changed, but most seems stock. - One of the powertube socket has also been changed
- It looks like that the output transfomer has been changed/moved.
- There is a choke on the schematic of the 1966 YBA-1, there's none in mine.
So here are the pics, I'll now begin to work on it this afternoon and tomorrow. Hope to make it work right so I can begin to mod it.
Behold the Canadian stack of dooooooooooom (In fact, I can't post it, Imageshack cant handle it, gotta fix it lol)
According to the serial number, I can tell for sure that it has been made somewhere between 1966 and 1968
Rectifiers, those look like they are solid-state
Power Transformer look stock according to my research, might have to contact Hammonds to get their exact specs. Same goes with the Output Transformer on the right.
And now, the gut shots. Look at all the place I have to screw around!
Volume pots for both channel. As mentionned, there is a capacitor on one of the pots, and both are 470k when the stocks one were 4M.
Input jacks, or what's left of them.
Some other pots. Caps seems stocks, but I'll compare the value to the schematic.
Standby switch and pilot light, wich doesn't look stock either.
Power tube sockets. One is different than the other, according to the resistor attached to it I'd say that the right on is newer.
Preamp tube socket. Not much to say. Wiring is old, haven't said that yet, so here's something to say.
Power chord, as I said, this isn't stock has it has a ground on it.
I suppose that those are diodes. It says PH 204 DSI on them, after a quick search they seems to be some old silicon diodes.
Those are connected with the input jacks. Those capacitors are obvisouly really young compared to the rest.
So thats pretty much it for pictures. I will not begin to try and understand how this little amp works. Not much is stock, seems that a couple of mods has been done, I'll try to get them all. I have some mods on my mind, we'll see how it'll turn out.
Cheers!
So, I am not totally done with my Weber. Thing is, I need to understand how to read schematics a little more, right now the amp is not working and I can't figure whats wrong. I need more knowledge, so I put the Weber on hold and did a quick find about another amp to practice myself. Since I was lacking a bass head, I decided to aim for one. After a quick search, I found the Traynor bass head to be fitting my request, all tube, fairly speced and quite easy to find in Canada. Another plus, those heads got lot of space to work in, and the flipped-over electronic construction mades it even more of an dream to work with.
So long story short, I tell my friend with who I play in my second project that I'm looking specifically for a Traynor YBA-1 Bassmaster head, he reply by this: "Oh, a bassmaster right? Yeah, I got one of those". So he really did had the exact head I was looking for, after some harassment he decided to sell it to me. Funny fact: He's also the former owner of the Big B cab I also own. So its a stack back together now!
Specs:
Traynor YBA-1 "Bassmaster"
Year made: Somewhere between 1966 and 1968
45 watt @ 8 ohm output
2 separate channel with their own volume pots (high/low input for both)
2x EL34 power tubes
3x 12AX7 preamp tubes
I haven't compared yet the amp to the original schematics, but I can tell for sure that some mods have been done.
- The originals RCA 7027A tubes have been replaced by EL34, dunno if the bias has been changed.
- One of the channel's input jacks has been removed and disconnected.
- One of the voume pots has a capacitor on it, and the other dont. They are supposed to be the exact same, I'll look more into this.
- The power chord has been upgraded with a three legged chord and the ground lift has been removed.
- I suspect that every pots has been changed, the original volume pots where 4M and they are now 470k ones, and all pots look about the same age.
- I can see that some capacitors has been changed, but most seems stock. - One of the powertube socket has also been changed
- It looks like that the output transfomer has been changed/moved.
- There is a choke on the schematic of the 1966 YBA-1, there's none in mine.
So here are the pics, I'll now begin to work on it this afternoon and tomorrow. Hope to make it work right so I can begin to mod it.
Behold the Canadian stack of dooooooooooom (In fact, I can't post it, Imageshack cant handle it, gotta fix it lol)
According to the serial number, I can tell for sure that it has been made somewhere between 1966 and 1968
Rectifiers, those look like they are solid-state
Power Transformer look stock according to my research, might have to contact Hammonds to get their exact specs. Same goes with the Output Transformer on the right.
And now, the gut shots. Look at all the place I have to screw around!
Volume pots for both channel. As mentionned, there is a capacitor on one of the pots, and both are 470k when the stocks one were 4M.
Input jacks, or what's left of them.
Some other pots. Caps seems stocks, but I'll compare the value to the schematic.
Standby switch and pilot light, wich doesn't look stock either.
Power tube sockets. One is different than the other, according to the resistor attached to it I'd say that the right on is newer.
Preamp tube socket. Not much to say. Wiring is old, haven't said that yet, so here's something to say.
Power chord, as I said, this isn't stock has it has a ground on it.
I suppose that those are diodes. It says PH 204 DSI on them, after a quick search they seems to be some old silicon diodes.
Those are connected with the input jacks. Those capacitors are obvisouly really young compared to the rest.
So thats pretty much it for pictures. I will not begin to try and understand how this little amp works. Not much is stock, seems that a couple of mods has been done, I'll try to get them all. I have some mods on my mind, we'll see how it'll turn out.
Cheers!
