TR50 Amp question

[slowbass]

Hello to all, sorry for my "technical english", I hope I'm intelligible !

I own a TR50 amp which I bought some 15 years ago. As it has 4 speakers (I replaced one that was broken), I assume it's the TR50G model :


The serial number decoder from Rickenbacker site says it's been manufactured in 1977.

http://www.rickenbacker.com/service_serials.asp

But I'm not sure my amp is standard. Are there other owners of this model who could help me identificate it ?
Is the front standard ?




I'm not a specialist at all and maybe I'm totally wrong, but, seeing some pictures over the web, my amp looks like a mix between the TR50G and the TR50B models.
When I opened it, I tried to compare with the schematics of the TR50G :
http://www.freeinfosociety.com/electron ... rtr50g.pdf
One can see two parts named PRE 6 and PRE 7 on the diagramm.

But my TR50 has instead parts named PRE 5A and PRE 7 :



Whereas curiously, the TR50B schematics has parts named PRE 5A and PRE 6 :
http://www.freeinfosociety.com/electron ... rtr50b.pdf

Is this normal ?

Thanks for your answers !

Here are other pictures of the amp :

[blueflamerick]

Front panel looks pretty standard to me. According to the solid state amplifier catalog I have, the main difference between the G & B amps was the speaker configuration ( 4 10's for the G, 1 15 for the B) and the lack of reverb in the B (the reverb knob was replaced by a volume knob on the B).

As far as the preamp circuit boards go, I don't think it really matters which one you have. From what I can make out on the schematics, the PRE 5A and PRE 6 appear to be very similar. I'm no expert when it comes to reading these things though. Maybe the factory was out of the PRE 6 when your amp came down the line and they just threw the PRE 5A in there.

[slowbass]

Ok, thanks for your response ! I wasn't sure about the amp because when I bought it secondhand from a music shop (in the early nineties), the seller told me it was one of their "demonstration amps" : I was a bit surprised when I saw it had been built in 77 !

[jwilli]

Not sure if this will help: My TR50 (4x10) is QS 3994. Mine is a guitar amp as per JH. Our amps are indentical on the outside. I haven't opened mine up though.

[Ontario_RIC_fan]

Very cool amp! I have a TR25 coming soon!