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Old 26th July 2012, 06:02 PM   #41
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Dear Kevin: I believe I didn't speak specifically of politic, instead I'm referring to facts of our reality. Politics' and their decisions influence all orders of our lives. Including the things related to audio and music. Even so, if you want to erase, my post, simply do it. No problem for me.

Osvaldo.
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Old 26th July 2012, 06:08 PM   #42
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Quote:
Originally Posted by Osvaldo de Banfield View Post
Dear Kevin: I believe I didn't speak specifically of politic, instead I'm referring to facts of our reality. Politics' and their decisions influence all orders of our lives. Including the things related to audio and music. Even so, if you want to erase, my post, simply do it. No problem for me.
Yes, politics and religion influence our life, but we don't discuss it here.
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Old 26th July 2012, 06:18 PM   #43
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Once, I believe I'm not discussing nothing, only narrating a fact of the reality. So real as that 2 + 2 is 4.

Here, in Argentina, it is very difficult to buy some electronic (and much other) materials, by a politic decision. I don't tell nothing if it is good or not. Only a fact.

Sorry to all other members of the forum.
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Old 27th July 2012, 04:19 AM   #44
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Osvaldo, The reason for the rule on politics and religion (among others) is because these topics tend to bring about very polar views which in the past have lead to lot's of unpleasentness.

You are free to discuss the difficulties in obtaining parts, the throw away society we live in today etc, just leave the political comments out and you will be fine.

Tony.
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Old 27th July 2012, 05:31 AM   #45
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Reading the old Radiotron handbook, which I think can be downloaded, they have quite a lot on the subject of when to turn on the B+ and what should happen in "standby". More than I wanted to know! There are even times when a partial voltage should be applied in preference to zero or full. There are other times when it's best to just shut everything off. Every old Dynaco and other tube thing I used to own had but a single power switch. Most every tube guitar amp has two switches, one for power and one for standby.
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Old 27th July 2012, 07:05 AM   #46
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Quote:
Originally Posted by Conrad Hoffman View Post
Most every tube guitar amp has two switches, one for power and one for standby.
The rumor is, first standby switch was added because electroytics could explode without load and sag. Then guitarists liked them because they could switch off the sound before unplugging the guitar leaving the stage, but coming back they could switch it on immediately and start playing.
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Old 27th July 2012, 10:23 AM   #47
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Originally Posted by Vinylsavor View Post
Hi!

Wire the two switches such that the filament switch not only switches the filament transformers, but also applies the mains voltage to the HV switch. This avoids that the HV can be accidentally switched on without filament voltage.

Best regards

Thomas
gSVNCApFBkq5Jzk98hmiQw.jpg
like this .
PL519 + 6JM6 PSE
meanwhile amplifier could switching to PL519 or 6JM6 operation standalone.
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Old 2nd October 2012, 03:20 PM   #48
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I found this somewhere:

"If you want to do 2 switches, I recommend you use 2 double-pole switches.
Wire a pole from each in series to feed the B+ power.
Wire a pole from each in parallel to feed the heaters.
No matter which order you hit the switches, one switch on gives you heater power, and the B+ comes on when both switches are on. There is no combination that gives you B+ without heaters on."
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Old 3rd October 2012, 12:07 AM   #49
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If you go half way down this web page you will find a diagram for a dual DPDT solution.

Audio ratbag: Tube Taster Linestage

You might get a laugh along the way.

ray
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Old 3rd October 2012, 05:29 AM   #50
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Default A picture worth a thousand words....

To expand the theme, here's a pic of the foregoing good idea....

Cheers!
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