Bob, you have been very lucky if you have never had any problems with
unmatched tubes.
I certainly have.
In fact I finally decided not to own any multi-tube amps anymore.
That solved that problem. (almost)
I now only have two amps, each with a single 3-500z, but...
I also have an old Heathkit HA-14 mobile amp with a pair of 572B tubes.
Can't seem to find a replacement for that one. There are no tiny amps with
single tubes running that much power.
I don't care much for most transistor amps.
Their linearity is the pits!
Though I wouldn't mind having the Elecraft 500w amp...
Jim sure raves about his!
73 - Rick, DJ0IP
(Nr. Frankfurt am Main)
-----Original Message-----
From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Katz Ajamas
Sent: Wednesday, April 01, 2015 5:14 PM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] Centaur Tubes odd ones in parallel
Kris-
Are these 811 or 572? I've never owned a Centaur but have not had any
trouble with non-matched tubes in other amps, provided they were from the
same OEM.
A single used 811 or 572 should be pretty cheap, so how about hunting up one
each of the missing?
73, Bob ah7i/w4
> ------------------------------
>
> Message: 9
> Date: Tue, 31 Mar 2015 15:39:40 -0400
> From: <km2km@twc.com>
> To: tentec@contesting.com
> Subject: [TenTec] Centaur Tubes odd ones in parallel
> Message-ID: <20150331193940.EK621.275017.root@dnvrco-web01>
> Content-Type: text/plain; charset=utf-8
>
> Ok, guys, here is the scoop.
>
> My trusty Centaur seldom needs to be re-tubed, BUT now I have two
> pairs of tubes, one pair Taylor, and the other pair Svetlana because over
time one
> tube left the troika for the electronic dump. Yes, matched tubes are the
> ideal, but having a couple of pairs sitting around doing nothing for
> me and no foreseeable makes me wonder. Just what would happen if they
> were a mixed troika. That would leave one tube in the bin ready for
another time.
>
> Any ideas on dire consequences?
>
> Many thanks,
>
> Kris KM2KM
> MERSCHROD
> 123 Warren Road
> Ithaca, NY 14850
>
>
> ------------------------------
>
> Subject: Digest Footer
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> ------------------------------
>
> End of TenTec Digest, Vol 147, Issue 34
> ***************************************
>
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