tubes age 139
have a large number of the 6189W tubes and a couple R-390A' that I need to
keep glowing!!!
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Date: Sun, 10 Apr 2005 21:41:42 EDT
Subject: Re: [R-390] 5814A Tube
My "Rider H A Middleton Tube Sub Guide" gives the following;
6189 = 12AU7 Good 6189= 12AU7WA Excellent
5814= 12AU7 Good 5814= 5814WA Excellent
5814= 6067 Excellent
No mention of 5814 = 6189 go figure... Hope this helps it seems it will work.
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Subject: Re: [R-390] 5814A Tube
I've used the 6189* as a sub for the 12AU7* in various things with little problem.
They seem to be a good sub for the 5814A/12AU7A in the '390/390A, at least
I've had good luck with them. If you've got 'em use 'em.
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Date: Mon, 11 Apr 2005 08:14:35 -0700
Subject: RE: [R-390] 5814A Tube
The 5814 uses more heater current than the 12AU7, 225mA vs 150mA per
section. Thus it's not always possible to swap; it depends on the circuit, hence
the "good" vs "excellent" rating in the chart below. There's no way to divine the
6189's current, gotta see a data sheet. In the R-390A this is irrelevant since all
the 12AU7 heaters are operated in parallel. R-390 owners, I don't have the
schematic handy but I bet they're in series; look before you leap.
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Date: Mon, 25 Apr 2005 23:15:40 -0700
Subject: RE: [R-390] R390 progress
Hi, I was surfing on Medley's site and see he says getting into the xtal box is
quite a job - I'll explore other things before going there. I pulled the two
oscillator tubes, 6AJ5's according to the manual and markings on the radio.
(What a job to get those little guys out of the cramped box -resorted to tongs
with tape to get some traction - I see why I need those missing tube pullers !!)
But one of mine was a 6AK5. Both tested ok and the 6AJ5 is apparently the
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