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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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19th Nov 2017, 12:02 am | #1 |
Heptode
Join Date: Jan 2008
Location: Bristol, UK.
Posts: 981
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Valve question.
Hello, this may be in the wrong section, if it is apologies, while having a look through some boxes then I found a couple of valves.
A P625 testing as 'Good' , didn't keep it on too long as the reading was fluctuating a bit. This is the interesting one, A Tungosram. Made in Hungary. HR 607. 6V - 200V. Barium Tube. Not having a listing on this one then I didn't attempt to do anything with it. These I have had for years and had forgotten about. If anyone can make use of these then please yell. Also if anyone knows what the HR 607 is all about then I would like to know please. Cheers. Geoff. |
19th Nov 2017, 12:30 am | #2 |
Rest in Peace
Join Date: Jun 2006
Location: Chard, South Somerset, UK.
Posts: 7,457
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Re: Valve question.
When you say a "P625", do you mean a "6P25"?
"Tungosram"? I've some valve boxes here (yellow and black) bearing the name "Tungsram" and I believe they were made in Hungary. I've never heard on an HR607. Sure you've read the inscription / marking correctly? Al. |
19th Nov 2017, 9:41 am | #4 |
Dekatron
Join Date: Aug 2013
Location: Wigan, Greater Manchester, UK.
Posts: 9,433
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Re: Valve question.
I presume the reference to barium is that the valve is indirectly heated and uses a cathode coated with barium.
From what little I understand of the link in Alfs post, that valve is a indirectly heated HF Pentode.
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Frank |
19th Nov 2017, 9:48 am | #5 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Valve question.
Some early Tungsram numbering system info, HR = HF triode:
http://www.jacmusic.com/techcorner/T...-1925-1934.pdf Lawrence. |
19th Nov 2017, 10:33 am | #6 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Valve question.
HR607...here it is (some data)...scroll down to 6 volt three electrode valves:
http://www.americanradiohistory.com/...ch=%22hr607%22 Lawrence. |
19th Nov 2017, 10:36 am | #7 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,535
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Re: Valve question.
With a 6V 70mA filament. With a bench PSU, should be OK to gently wake it up.
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19th Nov 2017, 11:33 am | #8 |
Heptode
Join Date: Jan 2008
Location: Bristol, UK.
Posts: 981
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Re: Valve question.
Thanks chaps, my boob I am afraid, I can read TUN---RAM and the bit in the middle was a bit blurred so it was a guess that went wrong.
P625 it is and it is clearly marked, a 4 pin large balloon valve with about 75% silvering, lovely. To my eyes anyway. Oh and it is an OSRAM no mistake this time. As always thanks for your help. Cheers. Geoff. PS. I don't have a use for them. |