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QRS 201A vacuum tube tested on calibrated KNIGHT 600B tester
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QRS 201A vacuum tube tested on calibrated KNIGHT 600B tester

Starting price (see what it sold for on eBay ↗) $20.00 as of Jul 28, 2026
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Past Vintage Parts & Accessories auctions
Condition Used
Condition tiers New Used Refurbished Damaged Unspecified
Ships from ZIP 620**
6camjcadmcon2 1,651 ratings · 100.00% positive
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Description

From the seller
QRS 201A no label or tube number. I have one like it that has QRS ON IT ALSO, WITH NO TUBE NUMBER. Mirrored.

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