Tube Amp Archive

Dag!

There is no need for a cap on the mains-switch.
If you use it though, it has to be a special one specified for use direct on wall-voltage. (In Germany those are called X2-Type capacitors).

Cheers,
Swen

Nobody!?

Hi there,

does anybody know the Pro22 or the GainMaster22?

Are these exact Dumble-copies except for the poweramp? Or do they differ in any way?

thanks!

I ordered the last bunch of 6PS from audiocap.uk but they don´t have the 100nF caps anymore.
Would be nice if I could get em all within one order

Hi,

does anyone where I can get the SBE 6PS Caps from (in europe)?

Im going for the Bassman-OT with the single 4Ω-winding.
What do you think is the best replacement for this OT? - seems as if there are no more fender-originals sold?!
Where do you get your OTs from?


Thanks!
- Swen

Hi,

in my opinion the dc-resistance is more important than the inductance.
The 4H-Fendertype (Twin, Bandmaster etc) should do the job.

Where did you get the Prosonic-OT from?

- Swen

Hi there, the ceriatone is a couple of months old so it should have passed the burn-in I suppose. I´ve decided to swap the OT for a Fender Prosonic and the choke for the Fender-Replacement (Bandmaster, Twin, etc.) In addition to that I will swap the powersupply caps and check the circuitry for odd-v...

Which kind of transformers would you choose? If I remember corectly, Dumble used Bandmaster-trannies right?

Tubes; special brands which you prefer?

Any other ideas? - what kind of circuitry is recommended for that 80ies Ford/Carlton-sound?

Thanks!
Swen

Hey guys, a friend of mine has a Ceriatone Overtone Special but he claims that he does not get those 80ies Carlton/Ford-Tones. So, has anybody modified a Ceriatone to a more "dumblish" sound? As far as I know, the Ceriatone has OD PS caps, Dale RN65 and CF resistors. So, what else could be done? swa...

Hi,

I believe that Greg sold it a few months ago on the bay.

- Swen

Jay, the cap across the switch does not only protect switch/diodes, primary it protects the speakers from gettin the full power of the switch-pop. But it is very nice to have and can save your tubes. Sorry, but thats a myth. There is no problem for a tube seeing U+ with a cold cathode as long as tha...

Hello, exactly what mlp said, stand-by switches are only needed if the power supplies voltage would exceed the cold cathode voltage when not loaded. Otherwise there is no need for a standby but the risk of having cathode poisoning on the power tubes if they are heated but no current is flowing thru ...

No, they use 400V and 630V Sprague-types labeled with "K&M Analog" in blue housing.

I gues Two-Rock orders them in that color.

I think 1000pcs is minimum order for custom-color and printing on Vishay Components.


Swen

Hello, sorry, but the skin-effect really only matters at frequencies well beyond our hearing range. You can easily calculate how much current your wire is able to handle via the following formula; Ri= l/(x*q) Ri is the wire´s resistance l is the wire´s length x is the materials conductance (58 for p...