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Send new message to groupFrom: Jon Yaeger - 27 Apr, 00:06
I recently picked up a single Electro-Voice A20C Circlotron amplifier in nice shape. Below is a link to a photo (not mine, but similar) and a manual. Interesting circuit! www.yaegerudio.com/a20c.jpg www.yaegerudio.com/a20c.pdf
3 Posts. Last post send by: Jon Yaeger - Sunday 27 Apr
From: Iain Churches - 26 Apr, 13:17
I wonder what the DC resistance of a 250mA fuse might be? I have just been speaking with a guy would told me that he has replaced the fuse from the CT of the OPT of his tube amp with a wire link, "because the fuse adds to the power supply impedance and does not have a linear response" He could not quote any reference to substantiate this. I wonder...
28 Posts. Last post send by: Iain Churches - Saturday 26 Apr
From: varispeed - 26 Apr, 03:52
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From: Patrick Turner - 25 Apr, 11:26
In some recent articles I posted here I showed that the formulas I thought were OK simply were not OK for use with shunt FB around an inverting amp. After a night's sleep, I speny an hour untangling the mystery of shunt NFB formulas that don'r work properly, and came up with this one.... Gain with shunt feedback applied, or closed loop gain, A'...
2 Posts. Last post send by: Patrick Turner - Friday 25 Apr
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From: Alex - 25 Apr, 04:07
Mainstream EL84s are supposed to operate in a standard class A mode (Ua = Ug2 = 250V, Ia = 48mA) at about -7.5V bias. I believe, 6BQ5s should do the same. "Old reliable" Soviet 6P14P, similar to EL84, reached the same working point at about -6.5V...-7V bias. However, a new Russian "Sovtek" 6BQ5 tube I purchased needed -9V bias to run at the same standard...
29 Posts. Last post send by: Alex - Friday 25 Apr
From: santoshanmsoft@gmail.com - 24 Apr, 15:06
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From: santoshanmsoft@gmail.com - 24 Apr, 07:14
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From: Andre Jute - 23 Apr, 16:41
Nah, you don't need to waste so much time trying to get more power out of some tacky little guitar amp. Just get a computer and the right software, which is the Peavey Revalver MKIII, and you can make any valve distortion you can dream up: "Finally, guitar amplifier modeling software from a company that actually builds tube amplifiers! ReValver is state...
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From: RealInfo - 23 Apr, 14:31
Hi I need some metal foot switches like those used in guitar effects pedals. Does anyone knows a good source ? Thanks ec
6 Posts. Last post send by: RealInfo - Wednesday 23 Apr
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From: RealInfo - 23 Apr, 00:24
Hi I want to do a chatode bias low power push pull stage , how do I calculate the cathode bias resitors ? Thanks ec
37 Posts. Last post send by: RealInfo - Wednesday 23 Apr
From: Ted - 22 Apr, 18:53
http://snipr.com/274A_tube
2 Posts. Last post send by: Ted - Tuesday 22 Apr
From: Iain Churches - 22 Apr, 17:57
Further to the discussion on heater current liming in an adjacent thread, it has just been suggested to me by e-mail that a current-limiting diode like the 1N5292 might be a good place to start. http://www.datasheetcatalog.org/datasheet/microsemi/SA5-47.pdf Any ideas? Iain
4 Posts. Last post send by: Iain Churches - Tuesday 22 Apr
