The Amp Garage

Likewise to you all!

Pretty lean at our home this year. But, I got what I needed. Three pairs of slacks, 2 belts, some "dress up" thermal shirts, the latest CD of Ozric Tentacles, Lucille's BBQ gift card, and some rare microbrews from my beer blogging younger brother.

This started out as a Super Drive build, but I converted it to a 2204 preamp mated to a 2-6V6 power section: Finished combo on left: [IMG:1024:768]http://i169.photobucket.com/albums/u223/fusionbear/IMG_0654_zpssm4qppqx.jpg[/img] [IMG:1024:768]http://i169.photobucket.com/albums/u223/fusionbear/20%20W...

One more question: Can you use the same driver circuit in the above posted schematic to drive a pair of KT66's? Obviously, I would consider changing the resistors on the 12AU7 to 33k load resistors. Would I still need the higher value grid stop resistors? This idea would presuppose I use a 8K primar...

@ gingertube: Thank you very much for your advice. I will draw up a schematic this week and post for a review and critique. Your points help quite a bit...

Likewise!

Hello Gents, after playing the amp quite a bit lately at louder volume, I came to the conclusion that it was a bit too tight feeling. I lowered the filtering. Please compare to the last revision. I lowered B1, B2, and the cap before B3 to 32uf each from 50uf each, respectively. The lowering of the f...

Even though I converted the amp to 2204 specs, I edited the schematic. It is the final version. The SD circuit is a awesome sounding amp in its own right, but in the end, I prefer the classic 2203/2204 preamp in a 20 watt 2-6V6 power section package. I want to particularly thank 10thTX for starting ...

Structo wrote:Good looking amp Carl.

Do you ever get RFI when using a lower value (10K) on the V1a grid?

No sir, plus the 100pf on the input jack helps too.

I left the 10k in the 2204 conversion. No issues. If they come up, it is real easy to increase the resistor to 33k or even 68k.

Are the modulation effects better in the loop than dirt boxes etc.? Nothing good when you front-end them? Thanks for the insight! ...and again, great looking build as usual. Effects in the loop are no issue. But the SD does not take pedals in front very well IMO. The 2204 takes just about anything ...

My oldest son is in the Army Med School in TX and just bought his first AR15. I can't wait to try it when I visit him...

Sometimes simple is better. I converted the loop to a single triode on the 12AT7 with a 1k/20uf on the cathode and 100K on the plate and it sounds much better! But, don't kill me guys, I converted the amp to a 2204.... Ah, fickleness...LOL... [IMG:1024:768]http://i169.photobucket.com/albums/u223/fus...

FusionBear, Some things to check on the schematic that I am unsure of: 1) cathode resistor on FX return is 470R? I would think it would have been a higher value such as 1.5k ? 2) please review the bias to see if it is drawn correctly? 3) the presence set up doesn't look right to me, but maybe it is...

thanks for the update Carl. Do you think a 272DX PT would work well in this build? slightly off from the ceriatone PT you used but close... How much current do you think the choke needs to be able to handle as built? should 150ma be sufficient? Also do you have your last schematic revision availabl...

1987' When I played in Black Sheep: [IMG:790:1024]http://i169.photobucket.com/albums/u223/fusionbear/CCI12122015_zpsc8sx48sl.jpg[/img] I was really proud of this accomplishment as a whole bunch of guys auditioned in this band, but I got the gig.... The original guitar players were Paul Gilbert and C...