Tube Amp Archive

Well I thought I would bump this thread as I'm starting to tackle this beast again after a long hiatus. On my SSS build I'm using Twin iron with 4 6l6GC tubes as per twin. What component changes are there vs the 6550 SVT schematic RJ posted earlier. Also do I stay with the 12BH7 or 12AT7 driver, sug...

I've been down this road and I modified a fender champ for big clean sound with a 6l6GC for bed room level. Altough is not a reverb a pedal could fix that. Here's what I did on a silverface champ I swapped out the original speaker and put a 8" weber a 10" would be even better. The original was fartt...

Hi Trace,

Thats correct i installed old O.T. which was good.
The Power trans is ordered 2 weeks away at least.
proper fuses installed.

I will advise when I install new power trans. Thx

I agree its strange to loose the hv and still have filaments.
I tested the choke and it ok.
I have corrected the HT fuse.


I will keep you posted.

it looks like the powert trans let go. no secodary voltage.
I have orderd a new one. wait and see.

Great replies everyone and thank you!

The first thing I did was check speakers, thier good. Phew!

I do have the 1 ohm to ground and they looked ok., but I will re-check.
I'm going to open it up tonight and take some readings.

I will look at the pins closer on the tube sockets.

cheers.

Hi Guys, I hoping someone can give insight as to whats wrong. i had my JCM800 clone working nice and wanted to try a different opt over my hammond. The wiring was different between them and I some how wired it wrong. When i turned the amp on there was a loud pop than silence! NOT GOOD. I checked fus...

The height of the cabinet with out feet is 11" and about 11.-3/4"" with the feet. length 27.5" , width 10"

were the tonal differences dramtic between twin iron=6l6GC vs SVT iron=6550 I'm sure you tried both iron and tube compliments wondering what you're thoughts were. These amps are loud and wondering if 2 x 6550 would tame it down with out altering the tone much. what iron, voltages, would complement a...

I need to check my semantics!
too funny!

can you forward me a layout, I'm interested what cans you used for the amp. They look better than the traditional TW caps glues together!

I was hopping there was a conveinent voltage chart for AB763 spec. i'm converting a 69 Twin Reverb to Blackface. I have seen them done on marshalls.

Can anyone offer a voltage chart vs pin on a Blackface Twin conversion.
I have seen these for the Marshalls, just not Twin reverbs.
Only for ease of rerfrence.

Thanks for reply, problem solved when I used a Fluke multimeter. I'm sold!

I am converting an 1970 twin reverb to Blackface specs, here's my problem. I put new caps in and use a light bulb in sereis to soft power up the amp which seems to work fine. Just for refrence I can check to neg bias at abot -29 volts (while insereis with bulb on) so everything appears fine. However...