Group: rec.audio.tubes

Electronic audio circuits which use vacuum tubes.

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From: Andre Jute -  28 Mar, 19:26

This was posted by Patrick Turner, known to Australian RBTers, to rec.audio.tubes. I'm forwarding it as of general and important interest to cyclists. -- Andre Jute > Because I am giving this little OT talk about cycling, > I'd like to include a report important for anyone to read regarding > their likelyhood of heart problems. > > Norman Swan is a guy...

22 Posts. Last post send by: Andre Jute - Friday 28 Mar
From: Iain Churches -  28 Mar, 18:38

As the result of previous discussions, and helpful info supplied by RAT subscribers, I built a box to test cap leakage and also reform some NOS electrolytics that were unused but had been in storage for several years. I decided to re-form the 450V caps via a 10M resistor chain, so that they charged *veeeery* slowly indeed. After 3 hours, they were...

18 Posts. Last post send by: Iain Churches - Friday 28 Mar
From: Nick Gorham -  28 Mar, 16:10

Hi All. I finally finished the A2 211 amp I mentioned in some postings to Patrick some time ago, so I thought I would post a link to some images. http://www.lurcher.org/nick/images/211/ Sorry the quality of the images leave a lot to be desired as they were from a camera phone, but they give the general idea. I am very pleased with the sound it...

28 Posts. Last post send by: Nick Gorham - Friday 28 Mar
From: khan.rema@gmail.com -  28 Mar, 09:50

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From: Andre Jute -  28 Mar, 00:08

In the last fortnight on most days my ride was either prevented or ruined by a cold wind from the North. And this has been a grim winter, with my central heating oil bill twice what it was last year. I certainly hope that after a particularly tough winter we shall not again soon hear from the instant short-series "experts" that we're all doomed because global...

8 Posts. Last post send by: Andre Jute - Friday 28 Mar
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From: Tom -  27 Mar, 10:47

Subscribe FREE Engineering & Technical Magazine at www.calculatoredge.com also check out free calculator tools you an use for your design / evaluation purpose. Tom

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From: JD -  27 Mar, 01:46

If I wanted to share a platform between these two tubes for a 18TMB would it be feasible to wire the two PP circuits in parallel , then have a DPDT switch that would apply heaters to one or the other ? Without heaters .. would the related circuit essentially disappear ?

27 Posts. Last post send by: JD - Thursday 27 Mar
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From: Engineer -  24 Mar, 23:16

Balancing P-P O/P stages (long post!) Cathode self-bias has an inherent balancing problem (but as, we know, two resistors are much better than one!) With two resistors to either side of the balance pot, with the slider grounded, the individual cathode resistances to ground vary with balance pot setting. Thus, measuring differential voltage across the cathodes...

7 Posts. Last post send by: Engineer - Monday 24 Mar
From: Iain Churches -  24 Mar, 19:14

> "Ian Thompson-Bell" <nospam@free.co.uk> wrote in message > news:frtjf7$2cnt$1@energise.enta.net... >> Iain Churches wrote: >>> >>> Stability is a problem that brings many a DIY project to >>> a shuddering halt. The builder switches the amp on, and >>> it oscillates wildly. He switches it off, checks all the >>> connections. Someone advises him...

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From: Adam Stouffer -  23 Mar, 18:38

What were the results? Did you manage to get all the lams back in? Was there any audible hum? I took apart a power transformer from an old tube Tektronix scope and wound two secondaries with 13awg wire. Its for a *gasp* solid state amp. Theres still a small stack of lams left over that I can't get back in. The last few had to be tapped in with a hammer....

3 Posts. Last post send by: Adam Stouffer - Sunday 23 Mar
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From: tom -  23 Mar, 09:17

Check this website www.calculatoredge.com you can subscribe several free technical magazines, you just have to fill an application form. Tom

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