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3 Attachment(s) Cascode Amp responds to Large Signal Burst by John L Stewart
Here is a different kind of test on the PP 6V6 AB2 amp that I posted a while ago. And an updated schematic. The PS is a Hammond 271X into a FW CT, 1N4007s into...
March 28th 13 05:27 AM
by Alex Pogossov Go to last post
4 1,033
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2 Attachment(s) Simple Low Power Constant Current Test Set by John L Stewart
This article was originally published in the July 2001 issue of AudioXpress magazine. It came to mind again the other day when Alex P mentioned the Sziklai...
March 25th 13 10:50 PM
by John L Stewart Go to last post
1 762
Darlington and Sziklai pair by Alex Pogossov
Hello, I uploaded another article. http://www.valveradio.net/en/home/audio/darlington.html Though it is not about vacuum tubes, I will be referring to it...
March 24th 13 04:27 PM
by patrick-turner Go to last post
1 796
4 Attachment(s) Class-B amplifier, control grids grounded, input to the screens. by Alejandro Lieber[_3_]
In figu http://1fcr.com.ar/classB.jpg you can see a very interesting diagram of the audio modulator of an old AM Gonset transmiter. A 12AT7 as voltage...
March 20th 13 02:24 AM
by John L Stewart Go to last post
8 4,293
Hybrid amps with tubes driving mosfets by patrick-turner
Hi all, if there is anyone at all reading anything, and not bored by the world and / or amplifiers. I've just posted up a page on Hybrid amplifiers where I...
March 17th 13 02:38 PM
by mick Go to last post
1 766
Walnut Hammond Chassis by MarkS
Just saw these, about $77 from Digikey & Mouser; more from Newark / Allied. http://www.hammondmfg.com/HWCHAS.htm Hmmm.....was looking for a reason to do some...
March 17th 13 05:08 AM
by MarkS Go to last post
0 670
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3 Attachment(s) Long Tail Phase Splitter by John L Stewart
In a previous post John Byrnes asked why I used a resister rather than an MJE340 for the long tail in a phase splitter. The short answer is that it works &...
March 16th 13 11:03 PM
by John L Stewart Go to last post
5 1,059
A Stupid Idea by Bret L
The latest AudioXPress has on its cover a stereo amplifier using one 4D32 tetrode in Class AB2 per channel as an output device. Why do people persist in acts...
(Multi-page thread 1 2 3 ... Last Page)
March 13th 13 05:53 PM
by The real GARY Go to last post
32 3,923
HT Stabilizer by Servo Kon
We offer the range of HT Stabilizer, HT inbuilt Stabilizer manufactured in compliance with international quality standards using high grade raw material. For...
March 13th 13 12:30 PM
by Servo Kon Go to last post
0 646
Boosted cathode follower, super cathode follower etc by patrick-turner
Recently we heard about Mr Pogossov's "boosted cathode follower" using a bjt between the cathode and 0V rail where the bjt has base current from an anode R...
March 4th 13 10:25 AM
by patrick-turner Go to last post
2 1,548
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1 Attachment(s) Replying to a Private Message by John L Stewart
Need some help here. How does one reply? All I can see is Forward, Delete & some other stuff but nowhere can I see how to reply. Thanx for help, Cheers to...
March 1st 13 07:23 AM
by patrick-turner Go to last post
1 686
FS: NOS KenRad 6SN7 -GT (Smoke Glass Pairs/Quads) VT-231s by [email protected]
On Sunday, August 22, 1999 3:00:00 AM UTC-4, Lets-Make-a-Deal wrote: > I have several beautifully mint NOS-IOB (In original Box) smoke glass KenRad > 6SN7s...
February 28th 13 06:17 PM
by Muck Krieger Go to last post
1 601
QUAD I amplifiers by Simon Whiting
Hi all, I don't know much about valve amplifiers, and I hope that your members might be able with some advice. I've got a couple of QUAD I* amplifiers, but one...
February 28th 13 09:56 AM
by patrick-turner Go to last post
1 739
valveradio.net by patrick-turner
On Sunday, 24 February 2013 23:19:59 UTC+11, Alex Pogossov wrote: > On the dusk of my days I decided to follow an example of some folks and launched my...
February 28th 13 09:24 AM
by patrick-turner Go to last post
2 723
6SN7GT PREAMP TUBES by Haywood Yastoppit
Here are some 6SN7GT dual triode tubes for sale on eBay. Various brands. Mostly used, but good older, tested, USA-made tubes. RCA, General Electric, Arcturus,...
February 11th 13 04:12 AM
by Haywood Yastoppit Go to last post
0 607
favourable triode section by GRe
http://www.mif.pg.gda.pl/homepages/frank/sheets/010/e/ECC82.pdf With reference to the Remark on page-1 of the above datasheet, does anybody know the...
February 10th 13 11:49 AM
by jh[_3_] Go to last post
8 882
I'm looking for a Boob Tube by [email protected]
For years I've heard about the Boob Tube. Yet, I've never been able to find one. I want to find a real tube that has boobs on it. Anyone know where to find...
February 9th 13 03:21 AM
by [email protected] Go to last post
0 589
All the best in 2012A. by [email protected]
On Tue, 1 Jan 2013 00:11:38 -0800 (PST), patrick-turner > wrote: >2013 is an unfortunate year number. Remember 1913? - a...
February 3rd 13 02:52 AM
by patrick-turner Go to last post
1 609
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1 Attachment(s) 500-2500 volt, 200-250 ma CV PS by John L Stewart
Here ya are Patrick, a constant voltage PS that can be varied over a range of 500 to 2500 volts. I will leave it to you to come up with an amplifier suitable...
January 29th 13 01:39 AM
by John L Stewart Go to last post
0 623
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1 Attachment(s) 1600 volt 250 ma Constant Current PS by John L Stewart
This one was built in the 60's. It has both +ve & -ve rails for the error amp. Stability depends on the 85A2 gas regulator & the current sampling resister. Not...
January 24th 13 02:29 PM
by patrick-turner Go to last post
1 651
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