Epiphone EA-600RVT Solid State amp weak output vol

[Billythekid]

Hey I'm new to the forum. I was hoping someone could help me with a issue I'm having trouble with my 66 Epiphone EA-600RVT Solid State guitar amps output volume is really weak sounding not at all what it should sound like being a 100 Watt amp it should shack the windows rattle the house. I think it could be transistors, cold solder joints, bad filter caps, I don't know what is going on its just weak output volume. Anybody have this problem before and know some troubleshooting ideas and repair methods? I stumped on what to do. Thanks. William

[J M Fahey]

You asked this exact same question several times in SS Guitar, even opening several threads on the exact same subject.
After a few exchanges you posted it was "practically" solved:

I smacked the power supply PC board moved wires and that got it to produce the volume level i t should rattling the windows and pictures the way a hundred watter should.

So I don't understand your current:

my 66 Epiphone EA-600RVT Solid State guitar amps output volume is really weak sounding not at all what it should sound like being a 100 Watt amp it should shack the windows rattle the house.

You were suggested to resolder probable dry/broken solder joints in the area which reacted to your touching/flexing/pushing/twisting.

I asked you for the schematics and suggested you should inject an audio tone and follow it along the path, but since when I checked you had posted the above comment, about having found the issue , and were suggested a reasonable solution, considered the problem finished.

FWIW a lot of Techs visit both sites and anyway if you ask in 100 sites, most, at least the serious ones, will suggest same (working) solutions .

Those who suggested "it must be some thingie in there" do not really help, do they?
As in: " it could be transistors, cold solder joints, bad filter caps,"
or:
So it must be a short or need time to warm up the transistors a cold solder joint idk.
Don't understand what the actual problem is if you state, in the very same post, the contradicting:

But I'm glad it sounds loud like it should.

Unless all boils down to talking about your:

It's a rare Epiphone EA-600RVT Solid State guitar amp I've never seen anyone else have this vsame amp they only ran this model from 66' to 67' I'm thinking about a hundred were made from the info I've gathered super rare SS amp.

Agreed, it IS a cool amp, very rare, very advanced for its era.

To see the pictures:
Epiphone EA-600RVT Solid State amp weak output volume problem

[J M Fahey]

The original pictures were very annoyingly upside down.

Maybe it's the same to you, seeing them as "just a drawing" but for a tech trying to follow a circuit, doubly so something not seen for decades, is mildly irritant, to say the least.

Here I repost them, suitably rotated and slightly enhanced (sharpness and contrast):

[J M Fahey]

Continues:









Not strictly required for troubleshooting, but if you could add a couple cabinet pictures (given that they are quite incommon) , and even more of the inside and a speaker it would be most interesting.

I really wonder what speakers could they have used in 1966, specially bacause a typical 10"of that era would not have stood more than12-15W RMS ... and here we need **minimum** 25W RMS a piece, really more like 30/35W each .

Only 1966 10" speaker I can imagine is almost mythical Jensen P10N , the P12N magnet and coil mounted on a 10" frame.
Don't think ceramics were widely used way back then.

[52 Bill]

Thanks for posting the photos, I couldn't see them at the other site.

This amp is the same as a Gibson GSS-100. It came with two small speaker cabinets, each with two 10" speakers. I seem to remember them as being Oxfords, but I haven't seen one of these in quite a few years and it's been at least twice as long since I've seen one of the speaker cabs.

I don't know how rare they are, but they were very expensive when they were new.

Edit: A quick check on the web shows that the original speakers were Alnico CTS.