Tube Amp Archive

Damn that's a clean build!!!
Makes my 183 look hideous.
Nice job!

PPM/C means parts per million per degrees Celcius. It tells you how much the value changes per 1 deg. C of temperature change. The higher the number the more the resister value drifts with temp change. You usually pay a higher price for lower PPM/C so there may have been other differences in the res...

I missed the shared grid stoppers on the schematic. I used individual grid stopper resisitors in my amp as Phil and Firestorm are talking about and the switching works fine.

I have done something very similar only with a quad of EL84s and a pair of EL34s and two switches. I wired it as your schematic shows using the same type of switch that I use for power and standby. Are you sure your switch can handle the current? I do recall that I used 1k screen resistors on the '8...

Actually, it looks like the blue wire from the ground tab goes to a grounded tab on the phenolic strip. Since the socket is floated above the chassis (both physically and electrically) by the rubber o-rings the tube shield is no longer an electrical shield. It looks to me like they are carrying the ...

It turned out nice! I'm doing something similar with my build which is progressing at a snail's pace.

What plate values did you use on V2?

cr

Denis,
See the link in my post above....

I'd like a copy also.
clint_w30 at hotmail.com


I have found some info here:
http://freestompboxes.org/viewtopic.php?f=2&t=1734

It looks like your first two filter cap grounds and the power transformer centertaps are not grounded at the same point. Try moving your centertap wires over to the ground point of the 1st two filter caps and see if that helps.

triodecr

I friend sent me the link to this video:

http://www.dailymotion.com/video/x3wrzo

Amazing!

triodecr

Though I haven't been back to 18 watt since the BBQ Boy BS, I'm sad to hear that it is no more. Speaking of no m00re... I saw the GM amp promo on youtube and I can hear why he got other people to demo "his" amps. Yuck! At least tune the @*&# thing!!!

Really awesome work joe! Have you considered selling custom chassis'?

It looks like there is some kind of epoxy or G-10 insulator on the tube sockets of some of your builds. Care to elaborate?

triodecr

Thanks for the quick replies! I'll probably go with Angela I just wish I needed some of the other stuff they have to make use of the rest of the shipping charge. The amp belongs to a friend of mine. He picked it up at the local GC and I'm going to get it up and going for him. It hums horribly so thi...

I'm looking for a good source for a JJ 500V 40-20-20-20uF cap. I've looked at Angela Insts. but don't want to pay $10 for shipping one cap; Hoffman and AES are the other places I've looked but are more expensive. Any other suggestions? This is going in an early sixties Gibson Skylark BTW. Thanks, tr...