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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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27th Aug 2019, 2:18 pm | #1 |
Pentode
Join Date: Aug 2006
Location: Dorchester, Dorset, UK.
Posts: 114
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Rectifier valve
Good day all
I have a Rectifier valve with the logo missing on the glass envelope, but there is an etched number on the glass F31 and B8F I would be grateful if any one could indicate were this valve was made, ie it looks like a GZ34. Cheers Acorn |
27th Aug 2019, 2:27 pm | #2 |
Dekatron
Join Date: Sep 2007
Location: Oxfordshire, UK.
Posts: 4,311
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Re: Rectifier valve
I take it the type code is actually f31. f3 is the code for a GZ34 and the 1 is a version number. F3 is the code for a 35L6GT which would look rather different.
B means it was made in the Mullard Blackburn plant. 8 means it was made in a year ending in 8 (likely 1958) and F is the code for June. If there was an extra character, 1 to 5, that would tell you the week within the month. Cheers, GJ
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27th Aug 2019, 2:41 pm | #3 |
Pentode
Join Date: Aug 2006
Location: Dorchester, Dorset, UK.
Posts: 114
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Re: Rectifier valve
Thanks for the information, you have got it in one , yes its a Mullard GZ34 made in Blackburn, I thought it may be a GZ34 but had no idea where it was made.
Acorn |
27th Aug 2019, 5:48 pm | #4 |
Octode
Join Date: Jul 2004
Location: Evesham, Worcestershire, UK.
Posts: 1,423
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Re: Rectifier valve
Looks like you're sorted but sometimes shining the beam from an led torch on the glass can reveal the faint letters and numbers.
Greg.
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