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4 Attachment(s) What is it? by John L Stewart
What is it?
(Multi-page thread 1 2)
January 21st 13 08:48 AM
by Phil Allison[_3_] Go to last post
16 1,940
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4 Attachment(s) Simple Regulated PS Using 6N7 Pass Tubes by John L Stewart
In this one the 6N7s need to be driven into grid current to get anykind of useable output current. But the stabilization factor is porportional to the pass...
January 21st 13 02:00 AM
by John L Stewart Go to last post
6 3,012
FS: Set of 6GM5 pentodes ( neonoval based 7591A ) by overreactor
I need to raise some quick cash, so I'm selling off my collection of 6GM5 audio power pentode tubes from my repair parts stock. This tube is electrically...
January 18th 13 08:24 PM
by heavyP Go to last post
1 1,496
Apparently This Matters: Ruzzle by Valentine
Apparently This Matters: Ruzzle http://adf.ly/2836760/rss.cnn.com/~r/rss/edition_technology/~3/cJ5l4WYWCXw/index.html
January 7th 13 01:58 PM
by Valentine Go to last post
0 1,081
All the best in 2012A. by Andre Jute[_2_]
A positively thermionic New Year to all RATs. Andre Jute
January 7th 13 11:10 AM
by patrick-turner Go to last post
1 1,060
Post
WTS : New Pioneer DDJ-SX Digital DJ controller for serato software..$500 by mamakweew122
Willbill Planet Music Equipment. Are Professional Whole Seller Of All Kind of Original DJ Equipment,DJ/Stage Lighting at best whole sales offer and Currently...
December 28th 12 07:09 PM
by mamakweew122 Go to last post
0 817
Professional Radio Engineer by Alex Pogossov
Who is that "professional radio engineer", living not far from Canberra and selling dodgy tube...
(Multi-page thread 1 2)
December 26th 12 12:44 AM
by patrick-turner Go to last post
11 1,940
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1 Attachment(s) Hum Reduction for DHT Power Stage by John L Stewart
Steve Bench published an excellant cure for the AC DHT filament hum problem more than 10 years ago. See it at this...
December 13th 12 09:02 AM
by patrick-turner Go to last post
4 1,580
JADIS amp reformation by patrick-turner
Hi all r.a.t regulars, and to anyone searching about Jadis SE300B amps. I have put up a page detailing my work on reforming a pair of Jadis last month at...
December 6th 12 12:02 AM
by patrick-turner Go to last post
7 1,598
Electron Tubes Philips type #QB3-300 by Grumpy
15 available from TRACY CALIFORNIA ( New $70.00 each plus shipping)
December 4th 12 04:34 PM
by Grumpy Go to last post
1 1,184
Restored Antique Radios FS by Don Pearce[_3_]
On Thu, 22 Nov 2012 19:19:53 -0500, "Keith Park" > wrote: >Restored Antique Radios...
December 1st 12 04:45 PM
by Don Pearce[_3_] Go to last post
0 1,048
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2 Attachment(s) Simple NFB Simulations for a FB Pair by John L Stewart
Tried some simple nfb amplifier simulations today based on 6V6 OP driven by a 6SJ7. The amplifier uses the following settings- 6SJ7 G = 1.0 ma/volt rp = One...
November 29th 12 01:01 AM
by patrick-turner Go to last post
1 1,098
Direct-Coupled SE Amplifier using the EL509/6KG6 by patrick-turner
On Monday, 18 November 2002 08:14:10 UTC+11, Simon van de Laak wrote: > Hello RATs,Has anybody build the Direct-Coupled SE Amplifier using the EL509/6KG6...
November 20th 12 06:54 PM
by Me Go to last post
1 1,545
Direct-Coupled SE Amplifier using the EL509/6KG6 by patrick-turner
On Thursday, 21 November 2002 01:15:18 UTC+11, Denis wrote: > (Jon Yaeger) wrote in message >... >...
November 20th 12 12:30 PM
by patrick-turner Go to last post
0 1,478
Direct-Coupled SE Amplifier using the EL509/6KG6 by [email protected]
On Wednesday, November 20, 2002 6:15:18 AM UTC-8, Denis wrote: > (Jon Yaeger) wrote in message...
November 19th 12 09:44 PM
by [email protected] Go to last post
0 1,434
Interesting stuff re tube testing by patrick-turner
Some intersting tube stuff at the website at http://www.bartola.co.uk/valves/ He seems to get less THD than I have found in most tubes, but then he seems to...
November 19th 12 01:59 AM
by patrick-turner Go to last post
0 1,291
Luxman SQ38D by Trevor Wilson
Does anyone have a schematic for a Luxman SQ38D? I mostly require info on the tone amp section. The one I have has been modified and I need to restore it to...
(Multi-page thread 1 2)
November 16th 12 09:34 AM
by patrick-turner Go to last post
17 2,704
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2 Attachment(s) Local Cathode FB, UL Tap at Ground Part 2 by John L Stewart
Here is a version posted by Yves Monmagnon & his collaberators Tomcik & Wiggins to RAT on Sep 1/ 2004. Hey Patrick, it looks like Yves has you beat by a few...
November 14th 12 01:17 AM
by patrick-turner Go to last post
3 1,488
Local CFB with grounded ultralinear OPT tap, Partial Circlotron. by patrick-turner
While installing newly potted Hammond SEA1627 OPTs to a pair of Jadis 300B mono amps, my mind came onto the idea of using local Single Ended CFB without...
November 11th 12 05:47 AM
by patrick-turner Go to last post
3 1,174
3 Attachment(s) Triode or pentode with local NFB? by Alex Pogossov
The recent thread about the SET 300B based amplifier got me to question: Why triode? 1) Obviously, a triode 300B boasts low distortion say 2% at 6...8W...
(Multi-page thread 1 2)
November 9th 12 11:55 PM
by patrick-turner Go to last post
10 2,103
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