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Old 19th July 2012, 12:57 PM   #11
7N7 is offline 7N7  United Kingdom
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Quote:
Originally Posted by DF96 View Post
Yes, looks like a PL81 (or maybe EL81). PL81 and PY81 were very common in European black&white TV sets. PY82 is a supply rectifier, with no top cap.

Probably rare in the US is the Brimar 6BS7, a miniature low noise pentode with a top cap for the grid. Probably a variant of the 6BR7.
Philips, it seems were a little confused on the subject of top-cap for the PY82; the line drawing shows the anode connection at the top of the valve, whilst the base diagram shows anode at pin 9!

I had a Marconi valve voltmeter that was fitted with 6BS7 (or 6BS8?) with grid top caps. I converted my Quad IIs to run 6BR7s as suggested by Chris Beeching. Very satisfactory.

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Old 19th July 2012, 01:26 PM   #12
DF96 is offline DF96  England
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The data sheet you linked to shows it quite clearly as a single-ended valve. The only thing on top is the glass sealoff pip.
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Old 19th July 2012, 02:28 PM   #13
miklos is offline miklos  Canada
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Did you know the EL81 is completely different from the E81L?
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Old 19th July 2012, 03:03 PM   #14
7N7 is offline 7N7  United Kingdom
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Originally Posted by DF96 View Post
The data sheet you linked to shows it quite clearly as a single-ended valve. The only thing on top is the glass sealoff pip.
Yes that's right - in the representation of the envelope, but above there is a line drawing showing the anode connection at the top.

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Old 19th July 2012, 11:08 PM   #15
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Quote:
Originally Posted by 7N7 View Post
Yes that's right - in the representation of the envelope, but above there is a line drawing showing the anode connection at the top.

7N7
? Are you referring to the tube schematic symbol? That's as standard a symbol as you can find; it doesn't imply a top cap.
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Old 19th July 2012, 11:11 PM   #16
7N7 is offline 7N7  United Kingdom
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Originally Posted by leadbelly View Post
? Are you referring to the tube schematic symbol? That's as standard a symbol as you can find; it doesn't imply a top cap.
OK my mistake, thanks, a bit over-wrought I think today

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