B7G Quartz Crystals . - UK Vintage Radio Repair and Restoration Discussion Forum

Rileyman · 1st Jun 2021, 11:35 pm

I'm hoping someone can help me to decipher the labelling on Marconi B7G-based xtals . Many years ago my data-folder "went missing", and now I cannot remember how to decode the characteristics printed on the glass envelopes (and/or the boxes they came in). My data had been gleaned from an in-house M.W.T.Co. Data Manual , and I'm hoping that someone out there still has access to a copy -- or knows where I should be looking .

Examples of inscriptions :-

50/25/129
40/20/100
200/A/S
100/B/30
300/E/30
100/F/30

Or perhaps someone who worked at Hackbridge can point me in the right direction ?

Here's hoping !

Laurie.

1st Jun 2021, 11:35 pm	#1
Rileyman Pentode Join Date: Sep 2018 Location: Maldon, Essex, UK. Posts: 227	B7G Quartz Crystals . I'm hoping someone can help me to decipher the labelling on Marconi B7G-based xtals . Many years ago my data-folder "went missing", and now I cannot remember how to decode the characteristics printed on the glass envelopes (and/or the boxes they came in). My data had been gleaned from an in-house M.W.T.Co. Data Manual , and I'm hoping that someone out there still has access to a copy -- or knows where I should be looking . Examples of inscriptions :- 50/25/129 40/20/100 200/A/S 100/B/30 300/E/30 100/F/30 Or perhaps someone who worked at Hackbridge can point me in the right direction ? Here's hoping ! Laurie.