Build Complete-Quad 6V6 Early Doo Doo Brown Style

[LeftyStrat]

What kind of power output do you get from this configuration? I've always loved 6v6 amps, but the duals just don't have enough headroom.

I'm assuming with those higher voltages, a quad should be somewhere between 30 and 40 watts.

[ToneMerc]

I installed tubes and fired it up.

Dropping string as built: 680>15K>1.5K

AC: 123.6
heater: 6.7

V1 JJ 83S: 200/200
V2 JJ 83S: 203/206
V3 TS 12AT7W: 304/297
V4-V7 TS 6V6GT: 422/417 screens
bias: -24

2N3823 FET: Vcc= 15.9, Vd= 2.96, Vs= 2.66, looks like I need to increase the source resistor up and away from 2K.

TM

Post Mortem, an FET bias fixture would have been nice. I correctly biased the FET by changing the 22K and 2.05K to 18K and 4.7K. I might change the 15K string resistor to 20k to reduce V2 and V1 voltages a tad.

The voltages are now......

V1 JJ 83S: 204.9/205
V2 JJ 83S: 207.7/208.9
V3 TS 12AT7W: 304.2/296.2
V4-V7 TS 6V6GT: 424/420 screens
Bias: 22.7, 22.2, 21.3, 20.9

2N3823 FET: Vcc= 19.64, Vd= 10.85, Vs= 4.41

Time for shake down test and burn in.

TM

[ToneMerc]

What kind of power output do you get from this configuration? I've always loved 6v6 amps, but the duals just don't have enough headroom.

I'm assuming with those higher voltages, a quad should be somewhere between 30 and 40 watts.

This one is most likely closer to 50W.

TM

[ToneMerc]

New suit arrived today from my Boston tailor, amp should look pretty slick in it.

TM

[David Root]

Nice work TM! As usual. Taylor (Tailor) does real nice work, I just took delivery of that red suede zoot suit he had in the For Sale section recently. Very Christmassy!

Not sure what I'll put in it, have been thinking about a 50W Tweed ODS with a 5AR4. In a CE 4-hole chassis. I just got a pair of NOS EL37 that I kinda think would sound superb in the Tweed ODS, although I really bought them to try in my Corksniffer's 5E8A, but that sounds awesome with NOS Tungsol 5881s at 35mA.

[ToneMerc]

Nice work TM! As usual. Taylor (Tailor) does real nice work, I just took delivery of that red suede zoot suit he had in the For Sale section recently. Very Christmassy!

Not sure what I'll put in it, have been thinking about a 50W Tweed ODS with a 5AR4. In a CE 4-hole chassis. I just got a pair of NOS EL37 that I kinda think would sound superb in the Tweed ODS, although I really bought them to try in my Corksniffer's 5E8A, but that sounds awesome with NOS Tungsol 5881s at 35mA.

Thanks David, I was hunting the Mullard EL37 for awhile but I could never find any verified NOS in the price range that was willing to pay. It is a sweet tube and should work well in that combination.

TM

[jelle]

That looks great and 4x 6v6 should sound killer.

[ToneMerc]

That looks great and 4x 6v6 should sound killer.

Thanks Jelle

TM

[Structo]

What kind of power output do you get from this configuration? I've always loved 6v6 amps, but the duals just don't have enough headroom.

I'm assuming with those higher voltages, a quad should be somewhere between 30 and 40 watts.

This one is most likely closer to 50W.

TM

Probably a very ballsy 50 watts.

When I got back into tube amps a few years ago I could not believe how loud a 50 watt tube amp could get.
And being biased a bit cold was under 50 watts by a margin.

Toobz rule! [IMG:26:28]http://i23.photobucket.com/albums/b392/ ... s/Dude.gif[/img]

[amplifiednation]

I'm looking forward to seeing this all put together!!

Thanks TM.

TC

[ToneMerc]

I'm looking forward to seeing this all put together!!

Thanks TM.

TC

Taylor, eventually I'll get around to dressing it, but I need more NOS tubes as I've burned through all my AX7's. I just pulled the JJ/TS and put in my last NOS tubes. I changed the 15K string to 20K as the voltages with the NOS tubes increased. The voltages with the JJ/TS tubes should be in the the 185-190V area if they are installed again. The voltages with the NOS tubes are now.....

V1 RCA short gray plate 12AX7A: 193.8/198.9
V2 Sylvania black plate 12AX7A: 205/201.7
V3 Sylvania 12AT7: 301.5/296.4
V4-V7 TS 6V6GT: 421/417 screens
Bias: 22.6, 22.0, 21.1, 20.6


TM

[dreric]

TM

AS always another great build. I've followed your two threads on 6V6 builds and now I'm considering a 4-6V6 build. I'm wondering what the specs on your chokes have been.

Thanks

Eric

[ToneMerc]

TM

AS always another great build. I've followed your two threads on 6V6 builds and now I'm considering a 4-6V6 build. I'm wondering what the specs on your chokes have been.

Thanks

Eric

Thanks Eric , I like the platform as you can omit two tubes and run a pair of EL34's or 6L6's as well. Both chokes are just Fender style 40-100W chokes. Here's the black choke specs that I sent Heyboer.

022699 style: 2.810 mounting center, 4H, 100mA, black enclosed frame & endbells.


FYI in case you decide to do one, here the bias circuit: 45V tap>750>10K pot>12K tail. Has just enough range to bias up all 3 tube types.

TM

[talbany]

Mike
Here is another cool set up you can do with the output section.
This mod will let you choose between 2 6v's or 2 EL-34's or 6L's whatever you prefer, switchable or select between cathode and fixed bias. You of coarse have to set up separate bias supply's

Great work!!

Tony

[dcribbs1412]

TM

AS always another great build. I've followed your two threads on 6V6 builds and now I'm considering a 4-6V6 build. I'm wondering what the specs on your chokes have been.

Thanks

Eric

Thanks Eric , I like the platform as you can omit two tubes and run a pair of EL34's or 6L6's as well. Both chokes are just Fender style 40-100W chokes. Here's the black choke specs that I sent Heyboer.

022699 style: 2.810 mounting center, 4H, 100mA, black enclosed frame & endbells.


FYI in case you decide to do one, here the bias circuit: 45V tap>750>10K pot>12K tail. Has just enough range to bias up all 3 tube types.

TM

Thanks for the info TM
This might be in my near future...
few questions if possible...
you running NOS 6v6's?
can I ask the PT specs( it's a custom order

Thanks again...and have a safe Happy New Year


Darin