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11 Pages«<7891011>
CarverFest Tube Amplifiers
weitrhinoOffline
#79 Posted: Sunday, February 26, 2012 3:44:34 PM(UTC)
 
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weitrhino

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TNRabbit;87571 wrote:
 
No, but burned my fingers black~  
  • Yikes
Gary
 
 
Vitamin E.  Nuff said. 
Main System:180 Tube Monoblocks, ALS Plats, Oppo BDP-93, TD-1400,
TX-11b, Sunfire Classic Vacuum Tube Preamp, C-9, Dual CS 505-1

Bedroom System: M500t, DTL-200, C-16, TX-11a

In Reserve: Sunfire Ultimate Receiver, M500 MkII, AV-634 (2), TD-1440

Blue Mouth Promotions LLC Where the music matters most!
TNRabbitOnline
#82 Posted: Thursday, March 1, 2012 3:00:05 PM(UTC)
 
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TNRabbit

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Crap.  Amp #3 now blows the mains fuse every time I apply power to it.
 
Buzz is still there on #4 when they're both plugged in.  No closer than I was before, but now I have a DOA amp.
TNRabbit

My 5.1 & 2 Channel System:
Sunfire Theater Grand-IV Processor
Sunfire Cinema Grand Signature 400~7 Amplifier
Carver SD/A-360 CDP
Benchmark DAC-1 Digital-to-Analog Converter
Sony Multi-Disc Player (SACD/DVD-A)
Active bi-amping via Ashly crossover & 2 Rane PEQ-15 Parametric EQs
Carver AL-III Main Speakers
Sunfire CRS-3C Center Speaker
Sunfire CRS-3 Surround Speakers
Klipsch RT-12d Subwoofer
"elgrau" wrote:
"You're a freak'in genius Herr Rabbit!"

"martin1970" wrote:
"Left to his own devices, Bob would probably build something that looked like a turd and sounded like the breath of angels."
mbskeamOffline
#83 Posted: Thursday, March 1, 2012 8:54:50 PM(UTC)
 
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would a bad CAP do this????

maybe one of the 2 big caps is bad?

or one of the 600v 0.1uf caps

I think I read this some place, more likely to happen on the old stuff. but now that I read what your #3 amp is doing, it came to mind

you could also try the DIY site. 

when the problem is found it will most likely be a moment....

mbskeam

http://s9.photobucket.com/albums/a96/mbskeam/

I look to the sun,... yet I feel not it's warmth

Sie werden meine Flutwelle, I werden Ihre Sandkorn

#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
2 sets of ALS'3, set of SILVERS, set of PLATS
AUDIOCONTROL: phase coupled activator
KENWOOD: BASIC M2a (2)
TNRabbitOnline
#84 Posted: Thursday, March 1, 2012 11:03:19 PM(UTC)
 
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TNRabbit

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Bob's reply to an email asking for assistance:

Sent: Thursday, March 1, 2012 4:20 PM
Subject: Re: Need help with CarverFest amplifiers, Please!!
Hi Gary, wow, trouble in river city!

First thing is get some good output tubes. The Electro Harmonix are great and have a nice high voltage rating.
Then replace the DC restorer 1n4148 diodes with 1n4004 units. Replace the 15 volt zener with two 5 watt units hooked in parallel. Amp should work then. As for blowing fuses immediately, check the power supply diodes for a short. Use a simple VTVM and just measure them in-circuit. If one shows a dead short, replace it. As for the hum unit, it sounds as if the AC line is somehow connected wrong. Just inspect it careful and I'm sure you will find the problem just by looking hard with your eyeballs. Be careful, because right now I think you may have a severe shock hazard on your hands with this amp until you find the trouble.

If all else fails, send them to me. I'll fix 'em right up!

No sweat,
Bob Carver
TNRabbit

My 5.1 & 2 Channel System:
Sunfire Theater Grand-IV Processor
Sunfire Cinema Grand Signature 400~7 Amplifier
Carver SD/A-360 CDP
Benchmark DAC-1 Digital-to-Analog Converter
Sony Multi-Disc Player (SACD/DVD-A)
Active bi-amping via Ashly crossover & 2 Rane PEQ-15 Parametric EQs
Carver AL-III Main Speakers
Sunfire CRS-3C Center Speaker
Sunfire CRS-3 Surround Speakers
Klipsch RT-12d Subwoofer
"elgrau" wrote:
"You're a freak'in genius Herr Rabbit!"

"martin1970" wrote:
"Left to his own devices, Bob would probably build something that looked like a turd and sounded like the breath of angels."
zumbiniOffline
#85 Posted: Thursday, March 1, 2012 11:33:10 PM(UTC)
 
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zumbini

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When in doubt go to the source. Hope his advice is helpful.
Main System
Carver Gear: C-11 (BillD-modified, w/balanced outs), M-500 (refit by BillD), M-500t(x2) (refit by BillD), M-1.0t (MK2/opt2), SD/A 490t, TX-11b
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Office System: C-2 (modified by BillD, w/balanced outs), DTL-50, M-200t, TX-2, Musical Fidelity X-10D, Design Acoustics DA-30 (DA-20LF sub w/4 DA-10 satellites, sub reconed 2000)

Workshop System: MXR-130 Receiver, DTL-50 CDP, Design Acoustics DA-30 (DA-20LF sub w/2 DA-10 satellites, sub reconed 2010)

Son's System: CT-Seven, DTL-200 MKII, M-1.5t (DIY recap 2011), Hitachi PS-38 (TT), Klipsch KG2.5 speakers, PSB Century Subsonic 2i powered sub

Not In Use or Need Repair: Aphex 124A, Denon DCM-35 (CDC), Teac X10R (RTR), Technics SL-1200MK1 (TT), Yamaha CDX-820 (CDP)

weitrhino wrote:
oldtexasdogOffline
#86 Posted: Friday, March 2, 2012 1:53:10 AM(UTC)
 
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oldtexasdog

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I had one that blew the fuse everytime I ran the Varex up to 120v. Turned  out to be a bad coupling cap.
There are two holes in Daddy's head where all the money goes.
mbskeamOffline
#87 Posted: Friday, March 2, 2012 4:15:08 AM(UTC)
 
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for Rabbit...

 

on the bias circuit you need 2 of these....1N5352B    15V 5watt zener
what do you have in there now?

what do you have on the High voltage side of things?
stock diodes are  1N5399

mbskeam

http://s9.photobucket.com/albums/a96/mbskeam/

I look to the sun,... yet I feel not it's warmth

Sie werden meine Flutwelle, I werden Ihre Sandkorn

#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
2 sets of ALS'3, set of SILVERS, set of PLATS
AUDIOCONTROL: phase coupled activator
KENWOOD: BASIC M2a (2)
TNRabbitOnline
#88 Posted: Friday, March 2, 2012 4:04:46 PM(UTC)
 
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TNRabbit

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mbskeam;88019 wrote:

for Rabbit...

 

on the bias circuit you need 2 of these....1N5352B    15V 5watt zener
what do you have in there now?

what do you have on the High voltage side of things?
stock diodes are  1N5399

 
The DC restorer is the same you helped me with earlier in this thread; 15 volt/5 watt.
 
The rectifier diodes on the xformer output are upgraded models based on advice from Mark (radioeng):  http://parts.digikey.com...-do-201ad-mur4100eg.html
 
Technical/Catalog InformationMUR4100EG
VendorON Semiconductor
CategoryDiscrete Semiconductor Products
Diode Type Standard
Voltage - DC Reverse (Vr) (Max)1000V (1kV)
Current - Average Rectified (Io)4A
Voltage - Forward (Vf) (Max) @ If1.85V @ 4A
Reverse Recovery Time (trr)100ns
Current - Reverse Leakage @ Vr25µA @ 1000V
SpeedFast Recovery =< 500ns, > 200mA (Io)
Mounting TypeThrough Hole
Package / CaseDO-201AD, Axial
PackagingBulk
Capacitance @ Vr, F-
 
TNRabbit

My 5.1 & 2 Channel System:
Sunfire Theater Grand-IV Processor
Sunfire Cinema Grand Signature 400~7 Amplifier
Carver SD/A-360 CDP
Benchmark DAC-1 Digital-to-Analog Converter
Sony Multi-Disc Player (SACD/DVD-A)
Active bi-amping via Ashly crossover & 2 Rane PEQ-15 Parametric EQs
Carver AL-III Main Speakers
Sunfire CRS-3C Center Speaker
Sunfire CRS-3 Surround Speakers
Klipsch RT-12d Subwoofer
"elgrau" wrote:
"You're a freak'in genius Herr Rabbit!"

"martin1970" wrote:
"Left to his own devices, Bob would probably build something that looked like a turd and sounded like the breath of angels."
TNRabbitOnline
#89 Posted: Sunday, April 29, 2012 12:43:16 AM(UTC)
 
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TNRabbit

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FYI..
Sent these off to Bob for troubleshooting....
TNRabbit

My 5.1 & 2 Channel System:
Sunfire Theater Grand-IV Processor
Sunfire Cinema Grand Signature 400~7 Amplifier
Carver SD/A-360 CDP
Benchmark DAC-1 Digital-to-Analog Converter
Sony Multi-Disc Player (SACD/DVD-A)
Active bi-amping via Ashly crossover & 2 Rane PEQ-15 Parametric EQs
Carver AL-III Main Speakers
Sunfire CRS-3C Center Speaker
Sunfire CRS-3 Surround Speakers
Klipsch RT-12d Subwoofer
"elgrau" wrote:
"You're a freak'in genius Herr Rabbit!"

"martin1970" wrote:
"Left to his own devices, Bob would probably build something that looked like a turd and sounded like the breath of angels."
Nahash5150Online
#90 Posted: Sunday, April 29, 2012 2:11:05 AM(UTC)
 
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Nahash5150

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Dang. Sorry about all that trouble TNR...

I work on audio systems a lot, and when I hear that kind of buzzing two things come to mind - bad ground OR bad input connection. On rare cases a transformer can do that when they get old and their chassis literally vibrates with the 60hz hum and is amplified (very slightly). IMO the source of the buzzing could have come from the source of the audio signal, especially the jack of the source. A cracked lead or short of any kind in the input source can cause that kind of noise. That, in my mind explains why the only common souce of the buzz was not either of the amps, but the input source itself.

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