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Quad-II amp info and re-building by Patrick Turner
There is no doubt some ppl would never ever change one single thing in original Quad-II amplifiers. For those who loathe me saying old Quad-II have faults...
June 1st 14 03:43 PM
by Patrick Turner Go to last post
2 1,051
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1 Attachment(s) The Twin Coupled Amp, Crowhursts Unity Coupled Circuit by John L Stewart
For the curious & others here is how Crowhurst's solution to the Unity Coupled circuit works. Crowhurst’s solution is unique. His starting point was the...
May 30th 14 11:44 AM
by John L Stewart Go to last post
0 1,023
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2 Attachment(s) McIntosh using 8005 triodes as output by John L Stewart
Here is another alternative to the output section of the unity coupled cct. This one used a pair of 8005 triodes. Covered by Norman Crowhurst in an article...
May 27th 14 02:16 AM
by John L Stewart Go to last post
2 822
3 Attachment(s) Questions for Pat Turner by [email protected]
Dear Pat, I read your article about Quad ESL and tube amplifier online. I've discussion recently with my friends about stacking Quad ESL 57 and some even...
(Multi-page thread 1 2 3 ... Last Page)
May 24th 14 11:28 AM
by Patrick Turner Go to last post
53 4,633
Old (1933) paper on measuring tube parameters by The Phantom
I recently ran across a 1933 paper by W. N. Tuttle, of the General Radio company titled "Dynamic Measurement of Electron Tube Coefficients". It's a 14 page,...
(Multi-page thread 1 2)
May 11th 14 05:57 AM
by Patrick Turner Go to last post
12 1,688
A euphonious New Year to y'all — Andre Jute by Andre Jute[_2_]
If there's anyone left here, a euphonious New Year to y'all. -- Andre Jute
May 3rd 14 12:47 AM
by Andre Jute[_2_] Go to last post
3 998
Sanctions against Russia over Ukraine. by Patrick Turner
Is the end coming to Russian tube manufacture because it seems Russia wants to stop Ukraine from becoming economically aligned to the West? What will happen...
May 1st 14 07:12 AM
by Patrick Turner Go to last post
2 669
Marantz 7--Why so expensive?? by [email protected]
On Tuesday, October 20, 1998 3:00:00 AM UTC-4, David Anderson wrote: > Hi, > > I don't want to start a price-flame war, but I'm simply curious as to why >...
April 24th 14 01:15 PM
by Frank Lucas Go to last post
2 860
AA11 Heath preamp users??? by [email protected]
Hi Dave I know that this an old posting. Curious to know if you still have this mod up for grabs before mine gets restored. Thanks, Kevin
April 22nd 14 11:22 PM
by [email protected] Go to last post
0 575
100W monobloc amp details by Patrick Turner
I recently posted up a new page on 100W UL AB1 monoblocs with new schematics of amps using either 6 x EL34 or 4 x KT120. Included are PSU and protection...
April 3rd 14 10:21 AM
by Patrick Turner Go to last post
0 711
Sanctions against Russian Tube makers by Patrick Turner
So the Ukraine has a few troubles brewing and USA has threatened sanctions. I heard this news a awhile back and I could not help but thing Russians making...
April 3rd 14 10:16 AM
by Patrick Turner Go to last post
0 806
5B 255M amplifier? by bigwig
Hello, Im new to the group. Has anyone built an amp. with or played with 5B 255M?. I have a load of these valves and would like to put them to use. The...
April 3rd 14 10:06 AM
by Patrick Turner Go to last post
8 1,733
VTL 40/40 by Frank Lucas
Hi, is anybody out there with the schematics of this strange beast designed by David Manley? I tried to contact EveAnna Manley and she answered that I had to...
April 2nd 14 05:04 AM
by Stephie Bench Go to last post
1 696
General Precision Laboratory Preamp? by GerryE123
Since it seemed more appropriate, I posted the following on rec.audio.pro, but I did not get any replies: Hi: In my vintage hi-fi travels, I managed to pick...
March 19th 14 08:00 PM
by chreynest Go to last post
1 1,189
1 Attachment(s) Guitar Amp RF oscillation, tube warmer recipe by Patrick Turner
Recently I worked on a Fender Deluxe Re-issue which makes 21Watts at clipping with 2 x 6V6 in output driven by 12AT7 LTP. The input for clipping at signal...
(Multi-page thread 1 2)
March 10th 14 09:26 AM
by Patrick Turner Go to last post
13 2,097
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7 Attachment(s) Power Frequency Ripple Reduction in B+ Supplies by John L Stewart
This note describes a simple, low cost power supply improvement. It allows reduction of the power frequency ripple component (60 Hz in North America & 50 Hz in...
(Multi-page thread 1 2)
March 4th 14 09:30 AM
by Patrick Turner Go to last post
10 1,732
How to restuff a can capacitor? by Edward Morris
I need to restuff a can capacitor. Could someone tell me an easy way to do it? I've never done if before and dread is setting in. Thanks for your...
March 4th 14 05:25 AM
by Horace Go to last post
7 2,788
LTSpice, guitar amp tone control by Patrick Turner
Hi all. At 66yo, I have automatically been granted the license to be a GRUMPY OLD MAN, acronym GOM, aka Experienced Curmudgeon or EC. Why? because NERDS rule...
(Multi-page thread 1 2)
February 28th 14 04:04 AM
by Lord Valve Go to last post
17 1,756
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3 Attachment(s) Power Supply Ripple Sidebands by John L Stewart
Here are a couple of spectrums showing PS Ripple Sidebands on program material. One with the CLC filter in the cct while the other is with the L shorted. The...
February 28th 14 02:20 AM
by John L Stewart Go to last post
0 728
Guitar amp tone control calculators by Patrick Turner
I've been asked by a couple of locals in my town to make their guitar amps sound better. One has had 20 years as a working muso and the other teaches music and...
February 20th 14 06:37 AM
by Patrick Turner Go to last post
8 1,236
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