tubes age 151
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Date: Thu, 27 Oct 2005 07:54:50 -0400
Subject: Re: [R-390] Foreign tubes 12ax7 (r390/r388)
Well, my R-390A has no 12AX7's, but my experience with Eastern European
12AU7's (Tesla, now JJ) was less than stellar, with intermittent interelement
shorts. Don't get too wrapped up in the astronomical 12AX7 prices... some are
highly desired by the audiophile types and others are ignored. I'm sure the
ignored kind (even if Chinese or Russian or E. European) will do fine. Even
though just looking in the catalogs I'm surprised that used random 12AX7's
seem to sell for more than the new imports. And the JAN/industrial number
(5751) that's somewhat compatible seems to be pretty expensive too.
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Date: Thu, 27 Oct 2005 09:03:15 -0600
Subject: RE: [R-390] Foreign tubes 12ax7 (r390/r388)
Simple answer Russian tubes good, Chinese tubes bad. The 12AX7 is a
common domestic tube and the supply of this tube is still good.
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Date: Fri, 28 Oct 2005 09:57:34 -0400
Subject: [R-390] 12AX7 tubes
I lost the earlier digest but whoever was looking for 12AX7's should contact me
off list with how many they need and what they would like to pay or trade. I have
a supply of this series that are as best as I can tell NIB mill surplus. If an
audiophool wants to trade equal weight in gold they are welcome to but I'd be
happier if they went to BA crowd.
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Date: Mon, 31 Oct 2005 15:50:16 EST
Subject: Re: [R-390] Tube microphonics & performance
On a bad day you run what you got. You can use them, HOWEVER. Noise is
noise. Try them, they may be better than what you have running right now. Then
again they may not be better. Never turn down a tube. You can always use
them as part of your test set. If you are not using your line output, you could drop
one in that side of the audio deck. The microphonic per say will not hurt the
radio. It may add noise to the signal. If it is the difference between radio and no
radio, run them. Always run the best tubes you have.
You can compare tubes by hanging a dB meter on the audio output with a 600
ohm 1 watt resistor and comparing tubes with each other when plugged into
the same socket. A signal generator is easier to work with than the cal tone and
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