Carverfest Amp Tube Supernova

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tinpan
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Re: Carverfest Amp Tube Supernova

Post by tinpan » Tue Jan 31, 2012 4:33 pm

It was part of a matched quad....doh!
Martin, I'd get my money back for those tubes, they clearly weren't matched very well since you didn't light all of them up at the same time ](*,)

Seriously, it could be a problem in your amp or more realistically cheap tubes. I'm betting the latter. I'll probably spend a month with mine, if they last that long, before I try swapping them out.

One of these days I am going to get into some serious tube swapping, just not yet.
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Re: Carverfest Amp Tube Supernova

Post by TNRabbit » Tue Jan 31, 2012 6:42 pm

I had one blow last week in the same far right position. That's where the DC Restorer circuit is located...coincidence?

Maybe only coincidence. Has anyone else blown a tube in that position?
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OconeeOrange wrote:"Gary likes to play it 'loud' as do I. His system begs you turn it up until you die"

RIP WIlliam B. Dibble, 1948-2012. I'll miss you my friend.

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Re: Carverfest Amp Tube Supernova

Post by mbskeam » Tue Jan 31, 2012 7:05 pm

Maybe only coincidence. Has anyone else blown a tube in that position?

:-$ :-$ :-$ :lol: :lol: :lol: :lol: :lol:
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Re: Carverfest Amp Tube Supernova

Post by TNRabbit » Tue Jan 31, 2012 7:07 pm

119.8 volts on the input gives me 358 volts DC at the tube circuit. I think I had the MM set to AC the other day when I got 470~

It's a shitty little Craftsman MM....
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From FrankieD's lips to your ears: Sunfire - a quiet box of endless power.

Sunfire TG-IV/400~7 Amp
Carver SD/A-360 CDP
Benchmark DAC-1
Sony SACD/DVD-A
Active bi-amp: Ashly XR-1001 & 2 Rane PEQ-15s
Main: HotRodded AL-IIIs
Sub: Klipsch RT-12d
Center: Sunfire CRS-3c
Surround: Sunfire CRS-3 (x 2)

OconeeOrange wrote:"Gary likes to play it 'loud' as do I. His system begs you turn it up until you die"

RIP WIlliam B. Dibble, 1948-2012. I'll miss you my friend.

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Re: Carverfest Amp Tube Supernova

Post by Martin1970 » Tue Jan 31, 2012 7:17 pm

After a reflow and reseating the tube sockets, it seems to be working fine (for now).
ok2.jpg
ok2.jpg (144.4 KiB) Viewed 1551 times
I'm tempted to buy better sockets and get rid of these.
The tube that went off is running 40 degrees cooler than the other three.
Not sure if that's relevant.

Gary: 120AC vs 440VDC B+
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Re: Carverfest Amp Tube Supernova

Post by elgrau » Tue Jan 31, 2012 7:19 pm

"Has anyone else blown a tube in that position?'

That's what she said!


Sorry; but this problem seems to need a LOT of comic relief...... :(
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Re: Carverfest Amp Tube Supernova

Post by TNRabbit » Tue Jan 31, 2012 7:56 pm

Martin1970 wrote:
Gary: 120AC vs 440VDC B+
Then how come I have 358 volts on mine?
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From FrankieD's lips to your ears: Sunfire - a quiet box of endless power.

Sunfire TG-IV/400~7 Amp
Carver SD/A-360 CDP
Benchmark DAC-1
Sony SACD/DVD-A
Active bi-amp: Ashly XR-1001 & 2 Rane PEQ-15s
Main: HotRodded AL-IIIs
Sub: Klipsch RT-12d
Center: Sunfire CRS-3c
Surround: Sunfire CRS-3 (x 2)

OconeeOrange wrote:"Gary likes to play it 'loud' as do I. His system begs you turn it up until you die"

RIP WIlliam B. Dibble, 1948-2012. I'll miss you my friend.

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Re: Carverfest Amp Tube Supernova

Post by Martin1970 » Tue Jan 31, 2012 8:05 pm

I measured it with the tubes in.
Playing music on the DQ-8s, moderate level.

I think Mike got 20V less than me FWIW.

Did you measure tubes out?
Or at a different point?
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Re: Carverfest Amp Tube Supernova

Post by angelod307 » Tue Jan 31, 2012 8:21 pm

So I will ask bob in Florida next month for maybe a new / update design using a transformer that is more to the tubes 300 plus volts that they are designEd for. How much of a change could that be in the parts list?
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Re: Carverfest Amp Tube Supernova

Post by TNRabbit » Tue Jan 31, 2012 8:24 pm

Martin1970 wrote:I measured it with the tubes in.
Playing music on the DQ-8s, moderate level.

I think Mike got 20V less than me FWIW.

Did you measure tubes out?
Or at a different point?
Tubes in playing music. 458 at the big cap, 348 at the orange wire point on the tube pin.
TNRabbit
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From FrankieD's lips to your ears: Sunfire - a quiet box of endless power.

Sunfire TG-IV/400~7 Amp
Carver SD/A-360 CDP
Benchmark DAC-1
Sony SACD/DVD-A
Active bi-amp: Ashly XR-1001 & 2 Rane PEQ-15s
Main: HotRodded AL-IIIs
Sub: Klipsch RT-12d
Center: Sunfire CRS-3c
Surround: Sunfire CRS-3 (x 2)

OconeeOrange wrote:"Gary likes to play it 'loud' as do I. His system begs you turn it up until you die"

RIP WIlliam B. Dibble, 1948-2012. I'll miss you my friend.

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Re: Carverfest Amp Tube Supernova

Post by Martin1970 » Tue Jan 31, 2012 8:46 pm

118ac
425dc cap
353dc pin 9
411dc pin 7
13 pin 3
6.1 ac heaters

Hooked to amazing ribbons playing moderate level stereo 20WPC mode.
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Re: Carverfest Amp Tube Supernova

Post by Chauss » Tue Jan 31, 2012 9:02 pm

Mullard NOS and new versions are the ONLY 6BQ5's I know of that will handle 550v.....
Martin- if you check that tube on a tube tester- I bet it is still good- it was an over voltage condition that caused it to glow.

Cheers!~
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Re: Carverfest Amp Tube Supernova

Post by Martin1970 » Tue Jan 31, 2012 10:06 pm

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Re: Carverfest Amp Tube Supernova

Post by mbskeam » Tue Jan 31, 2012 10:35 pm

voltages on mine.

line 117v ac
B+= 410v

output tube
pin7= 407v
pin 9/orange= 355v
pin 2 both in spec

input tube
pin 6= 262v
pin 7 83v
pin 8 85v
pin 3 .349v

bias 13.25


both amps check about the same.
the B+ and a the 3.9K drop resistor check out at the same voltages
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"

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Re: Carverfest Amp Tube Supernova

Post by frenchguy » Wed Feb 01, 2012 12:53 am

martin & gary, I blew that same tube before leaving carverfest & just shut it down & unhooked everything & packed it up! when I got home found out my ct-23 was dead!! victim of that tube!! so there was no way I was gonna fire it up till I got new tubes!! mark suggested that I try some TAD tubes!! they are working & sounding great but only have about 20 hours on them so will give them some time to settle in. I also bought some cryoed mullards that I have yet to try!! I would never run that amp until you get new ones!! just my 02!! :)
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