Fender Concert amp
in [Repair]
|
Prev: Question for the Brits here, what do you callaBelling-Leeconnector?
Next: SMPS capacitor test question
From: N_Cook on 26 Jul 2010 11:39 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?
From: Ron on 26 Jul 2010 12:17 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 here: http://www.spamfighter.com/len The Professional version does not have this message
From: Arfa Daily on 26 Jul 2010 12:54 "Ron" <ron(a)lunevalleyaudio.com> wrote in message news:uoydnVAX4qqSKNDRnZ2dnUVZ7sWdnZ2d(a)bt.com... > 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
From: Meat Plow on 26 Jul 2010 13:36 On Mon, 26 Jul 2010 17:54:00 +0100, Arfa Daily wrote: > "Ron" <ron(a)lunevalleyaudio.com> wrote in message > news:uoydnVAX4qqSKNDRnZ2dnUVZ7sWdnZ2d(a)bt.com... >> 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.
From: Ron on 26 Jul 2010 14:36
On 26/07/2010 17:54, Arfa Daily wrote: > > > "Ron" <ron(a)lunevalleyaudio.com> wrote in message > news:uoydnVAX4qqSKNDRnZ2dnUVZ7sWdnZ2d(a)bt.com... >> 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 here: http://www.spamfighter.com/len The Professional version does not have this message |