39 ohm 5%. Pick one of similar size or if there is enough room get one twice larger to be safe. I would avoid inductive wirewound or carbon comp/film resistors just in case. I would still call Wolcott and would replace resistor with original one.
Wolcott Audio tube amp.what value resistor is this
I have a pair of Wolcott Audio P-220m Tube amp's this morning when I turned them on I got a puff of smoke from one tube socket. I turned it off replaced tube and turned back on.
The amp and tubes light up but it has an Auto Bias and it wont bias letting the amp to play.
I took the bottom cover off and at the tube socket were the tube failed there is a little tan resistor it is connected to one socket pin and solder to a board.
I can see that it is black not like the others so I guess it blew. it looks like a 5 min repair as there is just the two solder points right there
The resistor has orange, white, black and gold stripes on it Can someone tell me the value of it and how to determine the input voltage going into the resistor so I can determine the wattage.
I cant post a pic here of what it looks like but can email that to anyone who can help.
I tried calling Wolcott but they are only open Tuesdays and Saturday from I believe 12 to 3. That doesn't help me right now
This sucks I was finally getting set up for my first Turn Table which will be hear Friday and now this happens.
Thanks for any help you can provide.
Brian
The amp and tubes light up but it has an Auto Bias and it wont bias letting the amp to play.
I took the bottom cover off and at the tube socket were the tube failed there is a little tan resistor it is connected to one socket pin and solder to a board.
I can see that it is black not like the others so I guess it blew. it looks like a 5 min repair as there is just the two solder points right there
The resistor has orange, white, black and gold stripes on it Can someone tell me the value of it and how to determine the input voltage going into the resistor so I can determine the wattage.
I cant post a pic here of what it looks like but can email that to anyone who can help.
I tried calling Wolcott but they are only open Tuesdays and Saturday from I believe 12 to 3. That doesn't help me right now
This sucks I was finally getting set up for my first Turn Table which will be hear Friday and now this happens.
Thanks for any help you can provide.
Brian
11 responses Add your response
39 ohms, 5% tolerance Test w/a volt meter set for DC, from the resistor's connection at the board(pos probe) to a ground(neg probe). I suppose you know not to touch anything else in the chassis as there are lethal voltages stored in the power supply caps, even when the amp's turned off. Most amps have bleed resistors to drain that, but- play it safe in there anyway. |
Btstrg, check this resistor value web page to make sure you are reading the value properly. |
Darkmoebius Thanks for that web site!! Yes it is a 39 ohms, 5% it is a CARBON FILM resistor as the other said it was. I believe it is 0.5 watt. I have found 1 watt Carbon Film resistors but am having a hard time finding a 0.5 carbon film ones. Any ideas? Thanks again that web site is something to keep for future reference! |
Still no luck getting a hold of Wolcott. Any potential buyers need to be aware of this should you ever need service. Also they have no authorized repair service. This isn't good. Replaced the resistor and amp still doesn't bias. I contacted all there dealers on there web site and they don't know how to get a hold of Wolcott either. They don't answer emails or phone calls. Just another company with no regards as to what happens for consumer!! |
I just had my Wolcotts updated and repaired by Pat McGuire. They sound as good as when I bought them. He says that there is a more reliable configuration of resistors to the output whereas the the late Henry Wolcott's original resistor design (I believe the 39 ohm referred to above) was a somewhat questionable "tour de force" and led to failures. If you have a set of 220Ms and are having problems I suggest you call Pat McGuire. BTW there will be no East Coast repair center. Take my description of the modification gently since I am not an EE. |
