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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 1,610
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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 1,384
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 1,403
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 1,000
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
0 856
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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
1 908
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 1,284
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 1,280
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 1,208
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 1,079
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 2,258
Smile
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 1,266
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 1,001
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 1,734
3 Attachment(s) SET amplifier Q by Phil Allison[_3_]
** Hi all, a neatly built, home brew SET amp arrived on my bench this week, I understand it is about 10 years old. The tube line up is two 300Bs in parallel...
(Multi-page thread 1 2)
November 8th 12 03:10 PM
by John L Stewart Go to last post
19 2,088
ANN: HpW-Works V3.2 Spectrum Analyzer & Wave Generator by HpW-Works
Version 3.2 Supported MS Windows versions: - MS Windows XP, 32 bit & 64 bit with WoW64 mode enabled - MS Windows Vista, 32 & 64 bit with WoW64 mode enabled -...
November 8th 12 12:34 PM
by HpW-Works Go to last post
0 940
Mystery transformer by GRe
Some time ago I found a small transformer in the junkbox. It looks old, like from the forties or fifties era. I don't remember where it came from or was...
(Multi-page thread 1 2)
November 3rd 12 12:39 PM
by Phil Allison[_3_] Go to last post
16 1,914
2 Attachment(s) Sencore LC53 VS Sprague TelOhmike 6A by Trailboss
Disregarding the inductor function of the Sencore, what advantages, disadvantages for testing caps commonly found in audio amps. I have restored and...
October 20th 12 08:25 PM
by [email protected] Go to last post
8 1,883
Also can be found in classified by Grumpy
Ham Radio Ten Meter multi Mode: FM, CW, SB, AM President HR-2600 $250.00 Hub for phone/communication SynOptics 2803 In New York City: Manhattan Computers &...
October 16th 12 05:23 AM
by Grumpy Go to last post
2 1,281
1 Attachment(s) EL34 suppressor grid (g3) characteristics by Alejandro Lieber[_3_]
I am thinking in building an AM transmitter for 7.1 Mhz (40 meters) using a EL34 in class C as final. The idea is to modulate it by varying the negative...
(Multi-page thread 1 2)
October 14th 12 01:07 PM
by Alejandro Lieber[_3_] Go to last post
16 6,290
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