For Sale: 68 Guild Thunder 1 Twin Guitar Combo Amp - Mint

[powdog]

Hi guys. Hope I'm not too far off topic here, but I also have a T-1 2x10" twin that sorely needs new speakers. The ones in it now are not original. Just wondering if you would know what impedence speakers I should be buying and how to wire them (two 8 ohm speakers wired in parallel to create a 4 ohm load?...etc). Thanks a bunch!

 

[SFIV1967]

There is a schematics from 1966, not sure if that helps?
http://www.prowessamplifiers.com/schema ... 0T1RVT.pdf

Also here was a topic:
viewtopic.php?f=7&t=4431

Ralf

 

[john_kidder]

No comment on the amp, but what a treat it is to read through a John Henderson (capnjuan) thread.

I do miss that man.

 

[Default]

Hi guys. Hope I'm not too far off topic here, but I also have a T-1 2x10" twin that sorely needs new speakers. The ones in it now are not original. Just wondering if you would know what impedence speakers I should be buying and how to wire them (two 8 ohm speakers wired in parallel to create a 4 ohm load?...etc). Thanks a bunch!

That would be the most likely scenario. What impedance speakers are in there now, powdog?

I miss him too, John! I was in contact with him, one way or another, every day.

 

[powdog]

Hey guys. That schematic and thread are for the T-1 reverb, which used a 12" main speaker, and a separate 8" speaker just for the reverb signal, like the old Hammond L100's.

I'm afraid I'm at a loss here. It's been quite a while since I've posted anything on this forum. I really expected capnjuan to respond to this query, as he used to do when I would post a Guild amp subject. I get the impression that I won't be chatting with him any more. My loss. Our loss.

My amp is running two 10" no-name speakers in parallel creating a 4 ohm load. Just wanted to make sure that I shouldn't be running two 16 ohm speakers for an 8 ohm load.

 

[SFIV1967]

That schematic and thread are for the T-1 reverb, which used a 12" main speaker, and a separate 8" speaker just for the reverb signal, like the old Hammond L100's.

Sorry for that, I am not an amps guy...maybe somebody else has an idea. And yes, capnjuan cannot answer anymore...
Ralf

 

[fronobulax]

I really expected capnjuan to respond to this query, as he used to do when I would post a Guild amp subject. I get the impression that I won't be chatting with him any more. My loss. Our loss.

CapnJuan lost his battle with cancer a few months ago.

We miss him and default seems to be the person trying hardest to fill his shoes when it comes to amp questions.

 

[Default]

Without knowing what the secondary impedance of the transformer is (there are ways, with hooking an ac supply to the tranny), it's safe with assume the double/half rule applies. You can double or half the speaker load without hurting anything. If your ot is looking for an 8 ohm load, you can run 2 speakers in parallel for a total of 4 ohms or in series for a total of 16 ohms without blowing anything up or shortening tube life.
I would run a couple of 8 ohm Webers for a load of 4 ohm, it seems to be the most typical configuration for an American tube amp of that vintage.
If you could, post the transformer codes from the output transformer and I'll see if I can dig up a manufacturer/model number.

 

[powdog]

Neither of the T-1 schematics capnjuan emailed me a while ago show the 2x10" configuration, but only show OT's with an 8 ohm secondary. I guess I'll go ahead and run a pair of 8 ohm Webers as suggested. Thank you everybody. I am saddened to hear the bad news, but also glad to see that Default has picked up the torch. Carry on!

 

[Default]

Sounds good, although I've been waiting a month for my Webers and still no word. :-/

I'd still like the numbers from the OT, if you can read them.

 

[powdog]

Here they are:

PT 007001
606604

OT 007002
606604
Looks like both are Schumacher from 1966. It's a great amp, full of mustard caps. Hope this works for you.

-Ethan