The Amp Garage

I wonder if electrical wire for the house could be used as buss wire or is it to thick and oversized. I think 16 AWG is the size i have lying around in the garage. Nice build Mark! I used brass rod in the past (sometimes hardware stores have it in the welding area), but lately I've been using house...

mean't to tell you that the half-power switching doesn't look quite right in the 183 layout.. here are the notes I got from Shad reguarding the /2 power switch.. Half power is a little funky. Cathodes should go to the switch poles. > R's on the top throws, ground on the lower throws. If you see som...

Here's an alternate schematic that shows every feature so you can use it as a build 'check list'. I've deviated in the area of the footswitch since I have a Silk Road two-button that I want to use. Also, I plan to use 6CA7 tubes. UPDATED: I forgot to adjust the dropping string and B+ voltages when a...

Thanks I'll take a look at it..Good luck with the build T Here's the schematic... I like to have a complete schematic that I can use to build against (highlight each wire/node)... this one has the MOJO763 transformer in it. I'll cross-post in the files section. Edit: Schematic updated with change t...

Twin/Showman http://www.mojotone.com/amp-parts/transformers-blackface-power/Blackface-Showman-Twin-Reverb-Power-Transformer Tony Thanks Tony! That one looks perfect. BTW... mean't to tell you that the half-power switching doesn't look quite right in the 183 layout... I have a schematic coming, but ...

Is that place a surplus dealer? I was looking at their pot selection and it seemed like a lot of different stuff. The cap that mdroberts linked to is a radial snap in cap. I don't see any like dcribbs has. It looks like surplus/grey market to me. I can't find the dcribbs ones either... I was just h...

dcribbs1412, Your having fun sourcing parts too huh :) I don't recognize the caps you are using there! I ended up with some F&T main filter caps and Nicon for the others. Mark http://www.westfloridacomponents.com/RE031/330uF+385V++Radial+Electrolytic+Capacitors+B43502-D337-M90.html CHEAP! 3402 avai...

Martin shouldn't that be 460v. Yes, didn't proof read well enough; thanks for pointing it out. Mark, The Hammond 290FX Twin PT replacement puts out 423V from 122VAC at the wall in my ODS. It was ~440V unloaded, as I recall. It is supposed to produce period correct voltages, I believe. Lots of succe...

FWIW, the Fender Twin Reverb AB763 schematic (1964) shows PT 125P34A and 360V on the 6L6 plates; 340 VAC at the HT. I found this bit of history on an amp rental site: "The rating of the amplifier's output power was also upgraded to 100 watts. Fender factory schematics show slightly higher voltage o...

Where did you get the filter caps? Haven't been able to find anything myself... I may opt for the EPCOS Radials and modify the PS board a bit. Where are you going to put the half-power switch? I'm thinking between the IEC connector and the fuse holder, closer to the fuse holder, centered on the powe...

Ciao the REAL question is what are the specs of tf 130 power transformer used on DUMBLE ODS ??you should get 465 volts on the plates , i think a 360-0-360 power trafo would be fine , with loaded circuit 345-0-345 CIAO This talk of TF130 and 465VDC (as per the talbany layout) is confusing me... On s...

Mark wrote:I was wondering which amps have these caps and where are they used in the circuit?

I think one or two showed up in the 183 layout/schematic, but if you go way back in the ampgarage threads I seem to recall they were generally frowned upon and 6PS 600V was preferred.

We have a few more of the black and silver chassis available on a first-come-first-served basis using shopping cart buttons on this page: http://cepedals.com/Dumble-Style-Chassis.html

Quantities are limited, but when there is sufficient demand we will do another run.

Thanks,

I visited the metal shop yesterday and everything looks on-track for the next batch of chassis. We are currently sold out of both the black and silver right now. I'll post again when we have chassis to ship. I talked to the shop about the stainless-steel galling and it is a known issue due to the ha...

Structo wrote:What size are those chassis mount screws?
I seemed to have stripped one out.

Thanks,

Tom

Hi Tom,
We use Stainless Steel 10-32 x 1.5" oval head screws. PM me.