Search found 3013 matches
- Mon Jun 03, 2024 6:27 am
- Forum: Technical Discussion
- Topic: Illinois brand capacitors still bad?
- Replies: 43
- Views: 1896
Re: Illinois brand capacitors still bad?
Here's an interesting deep background article on electro capacitor quality. https://en.wikipedia.org/wiki/Capacitor_plague In the late-late 1990s and early 2000s there was an industry-wide plague (!!) of electrolytic capacitor failures, especially noticeable in computer motherboards, but endemic to...
- Mon Jun 03, 2024 5:59 am
- Forum: Technical Discussion
- Topic: Illinois brand capacitors still bad?
- Replies: 43
- Views: 1896
Re: Illinois brand capacitors still bad?
I do wonder sometimes if it’s such a great idea to replace old caps when they are obviously in good condition, the rationale is people are looking for the sound and response from the vintage parts and I’m cutting them out and throwing them away. Of course my opinion maybe deeply flawed and if you s...
- Sun Jun 02, 2024 4:34 am
- Forum: Technical Discussion
- Topic: Illinois brand capacitors still bad?
- Replies: 43
- Views: 1896
Re: Illinois brand capacitors still bad?
Vishay caps are very good too. I got some recently any they were streets ahead of IC caps.
- Sun Jun 02, 2024 4:33 am
- Forum: Technical Discussion
- Topic: Illinois brand capacitors still bad?
- Replies: 43
- Views: 1896
Re: Illinois brand capacitors still bad?
I think the TAD caps are pretty good too. Here are cap values and ESR. Before I replaced the old Mallory caps in the SF Twin Reverb, I measured from the negative end of the cap and its earth connection and there wasn’t any leakage current measured on my multimeter. I do wonder sometimes if it’s such...
- Sun Jun 02, 2024 4:19 am
- Forum: Technical Discussion
- Topic: What do you think causes pins 2 and 3 to arc in octal sockets.
- Replies: 21
- Views: 486
Re: What do you think causes pins 2 and 3 to arc in octal sockets.
I use ceramic sockets in my builds as I try to avoid the 2 to 3 arc over. None of my amp have had this fault and my wiring is always tidy. I have accidentally switched on an amp without a load but I have yet to see this turn into a fault. I’m not saying it won’t happen, it just hasn’t happened yet. ...
- Fri May 31, 2024 10:03 am
- Forum: Fender Discussion
- Topic: Conductive boards again.
- Replies: 18
- Views: 1161
Re: Conductive boards again.
Fiberglass / G-10 Doesn't Mojo or Doug Hoffman make new boards for Fenders.? If i were to pull all the components and wires off the fiber board for cleaning, I would just toss that board out and install a glass board as above. :) Hoffman make G10 boards and Mojotone makes fibreboards I heard that a...
- Fri May 31, 2024 6:08 am
- Forum: Fender Discussion
- Topic: Hum in the boost circuit of a silverface MV Twin Reverb.
- Replies: 0
- Views: 75
Hum in the boost circuit of a silverface MV Twin Reverb.
I’m still working on a Silverface Master Volume Twin Reverb with the boost switch. It initially had a blown power transformer which I got rewound, then I noticed the board was conductive which I mentioned on this board. This was allowing the tremolo/vibrato oscillator to bleed into the audio (P.I. s...
- Fri May 31, 2024 5:21 am
- Forum: Marshall Discussion
- Topic: My first experience with Mullard reissue 12AX7’s
- Replies: 8
- Views: 396
Re: My first experience with Mullard reissue 12AX7’s
I found out today that Amplified Parts are going to stiff me for the 12AX7 as they don’t accept returns on microphonic valves. I was a bit annoyed as I don’t recall asking to purchase a microphonic 12AX7.
Yeah, I think I won’t be buying Mullard again.
Yeah, I think I won’t be buying Mullard again.
- Tue May 28, 2024 3:14 pm
- Forum: Technical Discussion
- Topic: Synergy Capacitors
- Replies: 9
- Views: 321
Re: Synergy Capacitors
So does that mean they are the same as the next gen SoZo caps? Hi Mark, This is what I told, yes; that they are the same construction as the original line of SoZos. I only have spoken word on that but don't know who is making them. The Synergy caps are reported to be made in the US. Some months ago...
- Tue May 28, 2024 10:45 am
- Forum: Technical Discussion
- Topic: What do you think causes pins 2 and 3 to arc in octal sockets.
- Replies: 21
- Views: 486
Re: What do you think causes pins 2 and 3 to arc in octal sockets.
Thanks for the link to the article. I will read it. I thought I saw a damaged ceramic socket. That would be quite a feat.trobbins wrote: ↑Tue May 28, 2024 10:43 am Photo of pin 2-3 arc damage on ceramic socket in attached article on such protection issue.
https://dalmura.com.au/static/Output%20 ... ection.pdf
- Tue May 28, 2024 10:43 am
- Forum: Marshall Discussion
- Topic: My first experience with Mullard reissue 12AX7’s
- Replies: 8
- Views: 396
- Tue May 28, 2024 10:41 am
- Forum: Technical Discussion
- Topic: What do you think causes pins 2 and 3 to arc in octal sockets.
- Replies: 21
- Views: 486
Re: What do you think causes pins 2 and 3 to arc in octal sockets.
I agree with the notion that flyback voltage and dust with some moisture content on the socket is likely to be the fatal combination, drawing the arc along the surface. Seems like giving the power tube sockets on older amps a good cleaning with alcohol might be a good idea. Thanks for your reply Ma...
- Tue May 28, 2024 10:29 am
- Forum: Technical Discussion
- Topic: What do you think causes pins 2 and 3 to arc in octal sockets.
- Replies: 21
- Views: 486
Re: What do you think causes pins 2 and 3 to arc in octal sockets.
I think it's also due to the ac filament power. Pin 3 is highly positive D.C. Pin 2 at a rate 50 or 60 times a second goes from being positive ac to zero and then that starts the attraction of D.C. Then pin2 then goes highly negative in relation to the D.C. Polarity of pin 3, so even a higher level...
- Tue May 28, 2024 10:26 am
- Forum: Fender Discussion
- Topic: Modding the Fender Standalone Reverb tank
- Replies: 1
- Views: 1849
Re: Modding the Fender Standalone Reverb tank
I think it would be noisier than it needs to be.
- Tue May 28, 2024 9:52 am
- Forum: Marshall Discussion
- Topic: My first experience with Mullard reissue 12AX7’s
- Replies: 8
- Views: 396
My first experience with Mullard reissue 12AX7’s
I hadn’t used the Mullard reissue valves before but it’s my understanding they are Sovtek made valves. I thought they might be good for this 1980 2203 amp. I got the valves from Amplified Parts (as I can’t purchase from CE Distribution.) I have arranged to get TAD 12AX7 to replace it, and contacted ...