5687

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I have a Mullard labled made in USA 5687 valve and I was wondering if anyone could tell me who was making these and putting on the Mullard brand. The only info on the valve are the numbers 173 apart from the 5687 in a rectangle with USA above it. Are these RCA's????
OLLY

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Topic - 5687 - OLLY 05:14:35 04/02/06 (2)

Re: 5687 - sacd lover 06:44:02 04/02/06 (1)

Re: 5687 - OLLY 22:38:34 04/02/06 (0)

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