Sugestions on next step..., Fisher restoration project....
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Sugestions on next step..., Fisher restoration project....| Analog Addict |
Posted: July 11, 2007 09:43 am
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 Do you want to live forever??? Horns and Tubes, Baby!  Group: Members Posts: 85 Member No.: 254 Joined: July 07, 2007  |
Wanted to get some opinions on the next step for restoring a Fisher 460T/A and MPX-70 console pull. brought it up slowly on a variac, added power tubes at 90 VAC, best I got out of it was some static/noise while adjusting the volume, along with a very faint hum/signal, but not the signal that I was inputting. I'm slightly behind the 8-all in that the knobs and faceplate are missing, so I don't have a good feel for the control operation. I did just buy a 440T with knobs and faceplate, and am hoping that the controls are identical, since the placement and number of knobs is identical. However, I'm a bit stumped at the next step. One of the paper caps on top of the amp did get warm, so i will be buying at least one 100uFD/250V cap, along with whatever caps might need replacing in the underside. Once I have finished this step, where do I go then??? I was thinking of removing the MPX unit from the circuit, and trying to find an appropriate input for a digital signal...
Thanks, Analog Addict -------------------- Cheers!
Analog Addict Jack of all Trades, Master of None "Music is the movement of sound to reach the soul for the education of its virtue." - Plato "The reliability of any piece of electronics is inversely proportional to the number of electrolytic capacitors in it" Show me a Moderator with a sense of humor.... |
 
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| Analog Addict |
Posted: July 17, 2007 12:34 pm
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Do you want to live forever??? Horns and Tubes, Baby! Group: Members Posts: 85 Member No.: 254 Joined: July 07, 2007 |
100 uFD/350 volt cap coming. Once replaced, I'll fire it up again and see what happens. I may have to try the phone input without the MPX unit onboard...
-------------------- Cheers!
Analog Addict Jack of all Trades, Master of None "Music is the movement of sound to reach the soul for the education of its virtue." - Plato "The reliability of any piece of electronics is inversely proportional to the number of electrolytic capacitors in it" Show me a Moderator with a sense of humor.... |
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| hakka26 |
Posted: July 19, 2007 10:21 pm
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 Millenium Member Group: Members Posts: 1231 Member No.: 57 Joined: August 02, 2006 |
Hope you get it up and runnning. I have nothing to offer as my tube knowledge is very very limited.
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| Analog Addict |
Posted: July 21, 2007 06:23 am
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Do you want to live forever??? Horns and Tubes, Baby! Group: Members Posts: 85 Member No.: 254 Joined: July 07, 2007 |
Partial success. I got the big cap on the amp replaced, and tried using a Walkman as an input source. Beautiful music ensued...
  However, the preamp is only putting out one channel and that is slightly distorted. I need to go through the preamp and prolly recap it.... -------------------- Cheers!
Analog Addict Jack of all Trades, Master of None "Music is the movement of sound to reach the soul for the education of its virtue." - Plato "The reliability of any piece of electronics is inversely proportional to the number of electrolytic capacitors in it" Show me a Moderator with a sense of humor.... |
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| dingus |
Posted: July 21, 2007 06:36 am
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 How can people be so cruel?  Group: Admin Posts: 4734 Member No.: 3 Joined: June 29, 2006 |
sweet. hope the work on the pre goes as well.
-------------------- Teledyne AR9, Yamaha B-2x, Yamaha M-2, Hafler DH-110, EAD DSP 1000, Wadia WT-3200.
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| Analog Addict |
Posted: July 24, 2007 08:39 am
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Do you want to live forever??? Horns and Tubes, Baby! Group: Members Posts: 85 Member No.: 254 Joined: July 07, 2007 |
Well, apparently it's not completely healthy...There is a bit of crackling going on in the background, seemingly intermittantly. I'm led to believe it's possibly a plate load resistor or a cathode resistor, or perhaps a tube socket or even a tube issue. I have tried a second set of EL84's in it with no change. Next is to pull the two 7247 driver tubes and see if it still crackles...Any other suggestions/advice?
Thanks.... Pre-amp is next on the list... -------------------- Cheers!
Analog Addict Jack of all Trades, Master of None "Music is the movement of sound to reach the soul for the education of its virtue." - Plato "The reliability of any piece of electronics is inversely proportional to the number of electrolytic capacitors in it" Show me a Moderator with a sense of humor.... |
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