DIY tube amps
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- SILVER-7 TUBE AMP
- Posts: 2652
- Joined: Sat Jun 06, 2009 10:56 pm
- Location: manning, sc
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
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
SILVER 7's
Amazing Line Source
2 SVS PB16 SUBS
#1 BLACK BEAUTY's made by the man, the myth, the legend Bob Carver
CARVER: TFM-75, TFM-45(3), SD/A-490T
SUNFIRE: Tube pre
WTL Amadeus GTA+DV DRT XV-1t
2 sets of ALS'3, set of SILVERS, set of PLATS
AUDIOCONTROL: phase coupled activator
KENWOOD: BASIC M2a (2)
“Youth ages, immaturity is outgrown, ignorance can be educated, and drunkenness sobered, but stupid lasts forever.”
― Aristophanes
The only thing I'll feel......will be the RECOIL
Necronomicon Ex-Mortis....... Klaatu Barada Nikkto
"We should seek the greatest value of our action"
SILVER 7's
Amazing Line Source
2 SVS PB16 SUBS
#1 BLACK BEAUTY's made by the man, the myth, the legend Bob Carver
CARVER: TFM-75, TFM-45(3), SD/A-490T
SUNFIRE: Tube pre
WTL Amadeus GTA+DV DRT XV-1t
2 sets of ALS'3, set of SILVERS, set of PLATS
AUDIOCONTROL: phase coupled activator
KENWOOD: BASIC M2a (2)
“Youth ages, immaturity is outgrown, ignorance can be educated, and drunkenness sobered, but stupid lasts forever.”
― Aristophanes
The only thing I'll feel......will be the RECOIL
Necronomicon Ex-Mortis....... Klaatu Barada Nikkto
"We should seek the greatest value of our action"
- Magnaryder
- SILVER-7 TUBE AMP
- Posts: 2992
- Joined: Fri Mar 09, 2007 1:00 am
- Location: Bucyrus, Ohio
Re: DIY tube amps
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.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.
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.
"Racing is life, the rest of the time you're just sitting around."-Steve McQueen
Its going to be used equipment when I sell it, so it may as well be used equipment when I buy it.
"Racing is life, the rest of the time you're just sitting around."-Steve McQueen
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.
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.
- Magnaryder
- SILVER-7 TUBE AMP
- Posts: 2992
- Joined: Fri Mar 09, 2007 1:00 am
- Location: Bucyrus, Ohio
Re: DIY tube amps
That;s why WE get the big bucks...and I got swamp land for sale.bob p wrote:thanks everybody for the help in making things clearer.
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.
"Racing is life, the rest of the time you're just sitting around."-Steve McQueen
Its going to be used equipment when I sell it, so it may as well be used equipment when I buy it.
"Racing is life, the rest of the time you're just sitting around."-Steve McQueen