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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Fender Concert amp
Bad splitter-driver plate/anode 100K resistor, what goes bad with them?
Causing rustle noise in output. Partial crack? or something chemical. I may as well replace the 82K while I'm at it , but is there any point to pre-emptively replacing all the HV droppers ? Anyone happen to know the datecode structure for Mallory electrolytics of the 1980s? say 4uF, 450VDC marked 012022 235 8346B 1982 and 35/52 from 235 or 1983 and 46/52 from the last number? |
#2
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Fender Concert amp
On 26/07/2010 16:39, N_Cook wrote:
Bad splitter-driver plate/anode 100K resistor, what goes bad with them? Causing rustle noise in output. Partial crack? or something chemical. I may as well replace the 82K while I'm at it , but is there any point to pre-emptively replacing all the HV droppers ? Anyone happen to know the datecode structure for Mallory electrolytics of the 1980s? say 4uF, 450VDC marked 012022 235 8346B 1982 and 35/52 from 235 or 1983 and 46/52 from the last number? Noisy 100k resistors is a common and well known problem with Fender amps, change em all. Ron -- I am using the free version of SPAMfighter. We are a community of 7 million users fighting spam. SPAMfighter has removed 1572 of my spam emails to date. Get the free SPAMfighter he http://www.spamfighter.com/len The Professional version does not have this message |
#3
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Fender Concert amp
"Ron" wrote in message ... On 26/07/2010 16:39, N_Cook wrote: Bad splitter-driver plate/anode 100K resistor, what goes bad with them? Causing rustle noise in output. Partial crack? or something chemical. I may as well replace the 82K while I'm at it , but is there any point to pre-emptively replacing all the HV droppers ? Anyone happen to know the datecode structure for Mallory electrolytics of the 1980s? say 4uF, 450VDC marked 012022 235 8346B 1982 and 35/52 from 235 or 1983 and 46/52 from the last number? Noisy 100k resistors is a common and well known problem with Fender amps, change em all. Ron I reckon that goes for all amps with 12AX7 stages, doesn't it Ron ? Arfa |
#4
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Fender Concert amp
On Mon, 26 Jul 2010 17:54:00 +0100, Arfa Daily wrote:
"Ron" wrote in message ... On 26/07/2010 16:39, N_Cook wrote: Bad splitter-driver plate/anode 100K resistor, what goes bad with them? Causing rustle noise in output. Partial crack? or something chemical. I may as well replace the 82K while I'm at it , but is there any point to pre-emptively replacing all the HV droppers ? Anyone happen to know the datecode structure for Mallory electrolytics of the 1980s? say 4uF, 450VDC marked 012022 235 8346B 1982 and 35/52 from 235 or 1983 and 46/52 from the last number? Noisy 100k resistors is a common and well known problem with Fender amps, change em all. Ron I reckon that goes for all amps with 12AX7 stages, doesn't it Ron ? Arfa I repaired an old 50 watt Silvertone a few months ago and found two 100k plate resistors one in the splitter and one in the reverb driver that had increased in value by nearly double. The splitter was a 12a-something but the reverb driver was a 6-something. |
#5
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Fender Concert amp
On 26/07/2010 17:54, Arfa Daily wrote:
"Ron" wrote in message ... On 26/07/2010 16:39, N_Cook wrote: Bad splitter-driver plate/anode 100K resistor, what goes bad with them? Causing rustle noise in output. Partial crack? or something chemical. I may as well replace the 82K while I'm at it , but is there any point to pre-emptively replacing all the HV droppers ? Anyone happen to know the datecode structure for Mallory electrolytics of the 1980s? say 4uF, 450VDC marked 012022 235 8346B 1982 and 35/52 from 235 or 1983 and 46/52 from the last number? Noisy 100k resistors is a common and well known problem with Fender amps, change em all. Ron I reckon that goes for all amps with 12AX7 stages, doesn't it Ron ? Arfa Not sure, I know I`ve changed a lot in Fenders. on the newer models it's such a lot of parping about getting the board out, it`s easiest to change the lot. Modern valve amps are so very noisy anyway, specially fenders - the don't make em like they used to you know! Ron -- I am using the free version of SPAMfighter. We are a community of 7 million users fighting spam. SPAMfighter has removed 1572 of my spam emails to date. Get the free SPAMfighter he http://www.spamfighter.com/len The Professional version does not have this message |
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