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| Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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24th Jan 2018, 11:38 am
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#1 |
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Pentode
Join Date: Dec 2005
Location: Leicestershire, UK.
Posts: 218
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PX25 Valve
I have one of these PX25 valves, and it has been tested. It draws 32mA which is 60% of an as new valve, this is caused by the inner filament pair being snapped. I am advised it would work in a radio but would not be good enough for Hi Fi.
I would appreciate any input/comments. Regards, Kevin. |
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24th Jan 2018, 12:55 pm
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#2 |
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Dekatron
Join Date: Jul 2008
Location: Charmouth, Dorset, UK.
Posts: 3,601
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Re: PX25 Valve
Depends how much power you need, I would think it should give about half its rated power. As you say probably OK in a single ended radio but not as half a push pull pair.
Peter |
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24th Jan 2018, 1:53 pm
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#3 |
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Pentode
Join Date: Dec 2005
Location: Leicestershire, UK.
Posts: 218
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Re: PX25 Valve
This is what I was told.
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24th Jan 2018, 2:40 pm
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#4 |
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Banned
Join Date: Dec 2013
Location: Middlewich, Cheshire, UK. & Winter in the Philippines.
Posts: 3,897
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Re: PX25 Valve
An audiophool would love that, its a unique low energy version with segmented heater.
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25th Jan 2018, 1:33 pm
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#5 |
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Pentode
Join Date: Dec 2005
Location: Leicestershire, UK.
Posts: 218
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Re: PX25 Valve
Guess that's all I needed to know, you may close this thread
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25th Jan 2018, 2:26 pm
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#6 |
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Octode
Join Date: Jul 2008
Location: Gloucestershire, UK.
Posts: 1,043
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Re: PX25 Valve
Hello,
As it is directly heated, if the filament has actually broken within the valve, then there is the possibility that it could touch the grid (say if it was knocked etc.) which could remove most of the bias on the grid with possible unfortunate consequences. Yours, Richard |
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