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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 06:47 AM
by patrick-turner Go to last post
3 835
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 10th 12 12:55 AM
by patrick-turner Go to last post
10 1,467
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 04:10 PM
by John L Stewart Go to last post
19 1,859
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 01:34 PM
by HpW-Works Go to last post
0 763
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 01:39 PM
by Phil Allison[_3_] Go to last post
16 1,711
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 1,698
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 1,137
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 5,750
Which way would You try to sell a 300B SE? by Fabio Berutti[_2_]
Dear fellow Rodents, I have not posted anything for a few years but it's nice to see that ol'guys are still around. I'd need just a suggestion: I spent so...
October 8th 12 11:03 PM
by Patrick Turner Go to last post
1 915
What is a 6L6 Radiotron? by JimK
It is clear with a roound hat-looking getter on one side of the bottom. Only marking at all is ^L^GC in white, and below it in white, RADIOTRON written in an...
October 8th 12 03:09 AM
by Phil Allison[_3_] Go to last post
1 593
1 Attachment(s) Is this test result OK? by JimK
I'm testing a Sylvania 6bq7a on a TV-7. Triode 1 jumps up to 50 or even 70, then drifts back down to 43. Triode 2 consistently goes to 43 and stops. The longer...
October 5th 12 03:36 PM
by John L Stewart Go to last post
1 735
3 Attachment(s) Bridge or Center Tap? by Paul D. Spiegel
For my next project I have acquired a transformer with two identical 450v secondary windings. I could put the windings in parallel and use a bridge...
(Multi-page thread 1 2)
September 30th 12 01:17 AM
by Phil Allison[_3_] Go to last post
12 1,670
Rarest Challenger Ever? by GreenTone007
I have a Bogen Challenger CHA 75A Pa amplifier dated 1974, I need a schematic, ive found the schem. for the CHA 75 but not 75A, it has 2 power tubes instead of...
September 19th 12 04:22 AM
by GreenTone007 Go to last post
1 814
1 Attachment(s) horizontal tubes by ZeeTso[_3_]
hi! i have no previous experience in building tube amps, and for my first project i want to build small 5W guitar/bass amp head. it will be simplified...
September 15th 12 03:25 PM
by John L Stewart Go to last post
5 1,098
Harman Kardon Citation 1 Kit Value by L.K. Brown
I have an unassembled Harman Kardon Citation1 kit, still in original boxes, Telefunken tubes. I plan to sell it but not sure what a fair value would be. I...
September 10th 12 01:31 AM
by L.K. Brown Go to last post
0 927
Harman Kardon FM100 - early version? by legg
I'm working on a Harman Kardon FM100 "Counterpoint II" that shows signifigant variations, internally, from the documentation provided by SAM's HF3 repair and...
(Multi-page thread 1 2)
September 2nd 12 02:36 PM
by legg Go to last post
14 2,163
What is this matched quad of new RCA 6L6GC tubes worth? by JimK
I want to sell these to help finance buying a new amp. Looking on Ebay I see they are not the holy grail RCA which are the black plates. Mine have gray plates,...
September 2nd 12 05:20 AM
by flipper Go to last post
4 1,151
Hammond M3 organ help, please by Steve Zettel
Hi, I've run across a Hammond M3 with the auxiliary speaker cabinet (not a Leslie, darn it!) for $150. Looks to be in very good condition, but like a lot of...
August 30th 12 03:46 PM
by stilldivin Go to last post
7 3,897
golden tube bias by [email protected]
On Friday, February 15, 2002 6:40:32 AM UTC-10, thh wrote: > does any one have a manual for a golden tube se40? i need to do a bias and > have misplaced the...
August 28th 12 08:44 PM
by [email protected] Go to last post
0 966
Tuning indicator without magic eye or meter by Patrick Turner
Probably because I am slightly pefectionist, if something goes wrong with any bit of my own gear, I'm usually keen to fix it and improve on it if possible, and...
August 24th 12 02:41 PM
by Patrick Turner Go to last post
0 1,278
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