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Old 23rd August 2011, 05:56 PM   #1
rongon is offline rongon  United States
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Default Simple B+ delay circuit for tube power amp?

Can someone suggest a simple B+ delay circuit for tube power amp with full-wave diode-rectified B+ around 450VDC?

I found some circuits for solid-state amps, none for tube amps -- except many references to why tube rectifiers are superior, etc.

The idea would be... Turn power switch on, heater supply turns on immediately, ten seconds later the B+ gets switched on.

Thanks.
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Old 23rd August 2011, 07:15 PM   #2
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I prefer to have separate power and plate supply switches. This is simplest.
Then you can also put the amplifier to stand-by mode.
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Old 23rd August 2011, 07:36 PM   #3
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by rongon View Post
Can someone suggest a simple B+ delay circuit for tube power amp with full-wave diode-rectified B+ around 450VDC?

I found some circuits for solid-state amps, none for tube amps -- except many references to why tube rectifiers are superior, etc.

The idea would be... Turn power switch on, heater supply turns on immediately, ten seconds later the B+ gets switched on.

Thanks.

Just for fun link:

B+ time delay circuit - your comments

Regards
M. Gregg
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Old 23rd August 2011, 10:41 PM   #4
Merlinb is offline Merlinb  United Kingdom
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Another related thread:
B+ time delay relay
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Old 24th August 2011, 02:05 AM   #5
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what about making a 555 circuit that has a low output at turn on and a hi output after say 30 seconds. the output can be to a transistor that activates a relay. if theres enough current available you could rectify the heater supply.
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Old 24th August 2011, 10:14 AM   #6
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I use this soft-start B+ for my 300B SE and it works perfect. (right lower part of the diagram)
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File Type: pdf triodeguy_Calrad%20modified.pdf (20.6 KB, 474 views)
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Old 24th August 2011, 11:40 AM   #7
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I think what you're looking for can be found here: tubes4hifi amplifier KITs page I don't own one, but it looks like a simple 555 and relay based circuit that will meet your requirements.
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Old 24th August 2011, 06:38 PM   #8
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There' no harm in putting in delay or standby switch arrangements (except for more possible points of failure), but they're really not necessary with 'low voltage' tube circuits (B+ V<750v).
Kevin O'Connor at LondonPower has commented on this, others also.

But more switches and lights are always fun!
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Old 24th August 2011, 07:51 PM   #9
wfmali is offline wfmali  Europe
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Originally Posted by VictoriaGuy View Post

But more switches and lights are always fun!
Exactly right - and that's why I like to use 6D22S or EY500A as B+ delay
Marcus
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Old 24th August 2011, 08:21 PM   #10
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Hi

That's right! Indirectly heated tube rectifiers, especially TV dampers as those mentioned are the easiest and most convenient way to get a delayed B+ and gentle rise of the voltage. And sounds better too

Thomas
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