Been burning in a $70 pair of Mullard Blackburn 12AT7 1957 pair. Quite a bit better than any Blackburn 6922 variant I tried. If you like warm tubes, highly recommended. Excellent tubes on the cheap.
Been burning in a $70 pair of Mullard Blackburn 12AT7 1957 pair. Quite a bit better than any Blackburn 6922 variant I tried. If you like warm tubes, highly recommended. Excellent tubes on the cheap.
I'm not having much luck pairing up the mid 50s Mitcham I have. First one arrived and tested virtually dead. Refunded. 2nd one arrived from a different seller, tested great, micro as fk in the amp. Refunded...third time's a charm hopefully...
I'm not having much luck pairing up the mid 50s Mitcham I have. First one arrived and tested virtually dead. Refunded. 2nd one arrived from a different seller, tested great, micro as fk in the amp. Refunded...third time's a charm hopefully...
Most of if not all my micro tubes were from the 50`s. The PW E180CC were the worst, went through 3 pair before I got a non micro. The 1 59 PW 6201 is horribly micro, other is micro on tap (decent), 1 55 ECC81 Heerlen is horribly micro as well, other tube is fine. I don`t test tubes first anymore except for shorts. They get a micro test first.
I've purchased probably a half-dozen different adapters from that same seller and all have been nicely constructed, wired correctly, and delivered in a reasonable time frame (about 2.5 weeks on average).
I've purchased probably a half-dozen different adapters from that same seller and all have been nicely constructed, wired correctly, and delivered in a reasonable time frame (about 2.5 weeks on average).
All 4 tubes are matched based on my visual finding of the Valvo logo. They all have a tear drop under the "A". Like they were stamped with the same exact stamp and at the same time.
All 4 tubes are matched based on my visual finding of the Valvo logo. They all have a tear drop under the "A". Like they were stamped with the same exact stamp and at the same time.
Aw, come on TK. At least give him a little credit for scratching out part of the perimeter line to make it at least look like he didn't paint them last week.
Aw, come on TK. At least give him a little credit for scratching out part of the perimeter line to make it at least look like he didn't paint them last week.
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