But in "those days" they didn't worry about matching tube in a lot of
amp, or IM for that matter. On one hand we had the 32S* series and
KWM-2 at 50 db IM or less, while on the other we had 19 sweep tube amps
at who knows what for IM, but -30 db (if that much) was doing really
good. The sad part is that only recently have top end SS rigs gotten
much better than - 30 db and that's usually class A..
Then new (and some old who should know better) complain that their new
Cadillac rig claiming 100 db plus of dynamic range and with super
narrow, steep sided filters claiming stupendous figures able to operate
within a few KHz of a 20 over 9 signal, complain their rig won't do what
they advertized, never mind, that station 3 KHz up has -30 db IM and is
20 KHz wide at S8.
Try to convince one of them that it's the other guy's transmitter and
not their receiver<LOL>
Fortunately those Multi(many tube)sweep tube amps are finding sweep
tubes difficult to find and getting expensive.
We're working on the wrong things!
73
Roger (K8RI)
On 1/20/2015 1:22 AM, Fuqua, Bill L wrote:
I bet you have a much better chance of getting two matching 4-125A tubes
than 10 sweep tubes.
Hi Hi Hi
________________________________________
From: Amps [amps-bounces@contesting.com] on behalf of Tom Osborne
[w7why@frontier.com]
Sent: Tuesday, January 20, 2015 12:13 AM
To: amps@contesting.com
Subject: Re: [Amps] Multi-tube vs Single or Dual-tube amps?
I remember the WRL Galaxy 2000 had 10 sweep tubes in it. That was quite
a beast :-) 73
Tom W7WHY
On 1/19/2015 7:27 PM, Bill Turner wrote:
------------ ORIGINAL MESSAGE ------------(may be snipped)
On Mon, 19 Jan 2015 20:48:26 -0600, you wrote:
( and eight 1646s might not hit 15 meters )
Don W4DNR
REPLY:
That problem of excessive output capacitance was solved long ago.
Consult any recent ARRL Handbook in the amplifiers section. Look for
info about an L-network in the plate circuit.
Bill W6WRT
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