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DIY tube amps

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angelod307

SILVER-7 TUBE AMP

Posts: 2693

Joined: Sat Jun 06, 2009 10:56 pm

Location: manning, sc

Post Wed Feb 26, 2014 11:35 pm

Re: DIY tube amps

Even with the schematic a mess, i just finished assembling nine tube amps without issue short of a sovtec running red as i bought them unchecked i guess. Not saying that it can not be better, but they do infact work well, just rolling a new tube in may be detrimental.
CarverFest: I just go for the arts and crafts
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mbskeam

User avatar

SILVER-7t

Posts: 1961

Joined: Mon Jan 25, 2010 2:32 am

Location: Woodinville Wa

Post Thu Feb 27, 2014 12:53 am

Re: DIY tube amps

a. somebody drew a schematic on a computer
b. somebody scratched out part of the bias circuit
c. somebody drew in another part of the bias circuit in the margin on the same page
d. somebody drew something else in the margin on another page, which looks like a voltage dropping adapter



A yes=Bob C
B yes=me, wrong parts in bias, to small of a zeners, would let amp red plate.
C yes=me, new Bob C design
D yes=me, Bob C design, this replacesthe 3.9k ohm/5watt resistor on the PS page, goes between B1 and B2


1. who drew the schematic in "a"
2. who crossed off something on the schematic as "b" and what did they scratch out
3. who drew that "c" stuff in the margin
4. who drew that "d" stuff on the last page. it looks like "d" is a kludge to fix an out of spec transformer.



1=Bob C
2=me per Bob C, red plated amp with wrong zeners in place
3=me
4=me, per Bob C, yes the transformer was/is to high of a voltage, causing the amps to red plate with some tubes, running at the very edge of safe



these are MY copys to work from, ALL the designs are BOB C
Mbskeam


#1 BLACK BEAUTY's made by the man, the myth, the legend Bob Carver
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Magnaryder

User avatar

SILVER-7t

Posts: 1968

Joined: Fri Mar 09, 2007 1:00 am

Location: Bucyrus, Ohio

Post Thu Feb 27, 2014 2:59 am

Re: DIY tube amps

bob p wrote:
4. who drew that "d" stuff on the last page. it looks like "d" is a kludge to fix an out of spec transformer.


The original design was for 7189s, they can withstand a much higher plate voltage than the EL84/6BQ5s we had with our kits. The outcome of the zener mod reduces the plate voltage allowing the EL84s to work in the amp.

easy peasy...well for Mike. he did the zener mod in my amps. I did the boutique mods.

the thread is here.

viewtopic.php?f=8&t=17835

ray
Magnaryder

Its going to be used equipment when I sell it, so it may as well be used equipment when I buy it.

Tim deParavicini's E.A.R. Yoshino V20 Integrated Amplifier, Fosgate Signature Phono pre, No. 50 and 51 Carverfest Tube amps, Hammond M3 tube amp, Ariston RD-40 Turntable w/ Linn Basik LSV tonearn, Grado Statement Master1 cartridge, Cardas Silver wire service and wire block, Carver TX-8 & 11 tuners, Carver TD-12 & 1700 decks, Tascam CC-222mkII CD recorder, Carver HR-742 reciever, DBX-3BX & 200xg & 120x, CarverAudio ALV prototypes, Alesis Studio One loudspeakers, Dahlquist DQ-8s, The Carver Research DarkStar Sub and Stax Earspeakers.

THIS SPACE FOR RENT...helping the blind to hear, one valve at a time
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bob p

User avatar

SILVER-7t

Posts: 1340

Joined: Wed Jul 18, 2007 10:40 pm

Location: Chicago

Post Thu Feb 27, 2014 2:42 pm

Re: DIY tube amps

thanks everybody for the help in making things clearer.
Carver Preamps: C-1, C-2, BillD's JVD-modded C-4000, C-9
Carver Amplifiers: BillD's C-500, M-1.5t (4) PM-1.5 (4) M-500t (2)
Repair/Restoration/Upgrade expert for all of these components.
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Magnaryder

User avatar

SILVER-7t

Posts: 1968

Joined: Fri Mar 09, 2007 1:00 am

Location: Bucyrus, Ohio

Post Thu Feb 27, 2014 9:07 pm

Re: DIY tube amps

bob p wrote:thanks everybody for the help in making things clearer.


That;s why WE get the big bucks...and I got swamp land for sale.

Bob.....glad Mike could help.

ray
Magnaryder

Its going to be used equipment when I sell it, so it may as well be used equipment when I buy it.

Tim deParavicini's E.A.R. Yoshino V20 Integrated Amplifier, Fosgate Signature Phono pre, No. 50 and 51 Carverfest Tube amps, Hammond M3 tube amp, Ariston RD-40 Turntable w/ Linn Basik LSV tonearn, Grado Statement Master1 cartridge, Cardas Silver wire service and wire block, Carver TX-8 & 11 tuners, Carver TD-12 & 1700 decks, Tascam CC-222mkII CD recorder, Carver HR-742 reciever, DBX-3BX & 200xg & 120x, CarverAudio ALV prototypes, Alesis Studio One loudspeakers, Dahlquist DQ-8s, The Carver Research DarkStar Sub and Stax Earspeakers.

THIS SPACE FOR RENT...helping the blind to hear, one valve at a time
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