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What a difference different tubes make (Read 129 times)
Rivieraranch
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Posts: 1725
What a difference different tubes make
04/20/20 at 17:52:59
 
In my Anniversary Mini I had been using Sylvania short, black plate 6189 tubes and 1974 RCA 807s.  One of the 807's sounded microphonic when I tapped it with a pencil as did one of the 6189s. The 807's had tested really high (6000 Microm-hoes where 5000 is nominal) and the combination of these with the inputs was very lively I would say.

Before this I had used some World War II National Union 807's for a long while and liked the character of their sound. I obtained a pair of old stock 1951 NU's on eBay. I tested them and the readings were much less than the RCAs. As I recall just over 4000 M/hos. Despite that they sound real good, very tubes, more lush than the RCA's. For inputs I found a pair of 1950's Sylvania 12AU7 back long plates. No micropahny there.
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MINI TORII ANNIVERSARY MODIFIED; SE84UFO; ZSTAGE; MONOLITH SPEAKERS; TECHNICS SL1200MK2 KAB MODDED TT; ONKYO 6 DISC CD; MARANTZ 2226B; SCHIIT MULTIBIT DAC; SENNHEISER HD-580 headphones
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