People are still running HB 4X1 amps and others continue to build when the
tubes have been on hand for ages or can be found cheap.
The big problem, even with NIB, is the seals leak and the tube slowly goes
to air.
Carl
KM1H
----- Original Message -----
From: "Karel" <kebenstr@bmts.com>
To: "Hardy Landskov" <n7rt@cox.net>; "Fuqua, Bill L" <wlfuqu00@uky.edu>;
"Jack Taylor" <jack@n7oo.com>; <amps@contesting.com>
Sent: Monday, January 27, 2014 8:08 PM
Subject: Re: [Amps] Tube swap
I still have 5 tubes, 4-1000A, 2 of them never used, 3 used ones, is there
still demand for these?
I started an amp (2 tubes). So far I did not finish the project yet, not
sure if I will. Perhaps if I go with 1 tube only.
Karel Ebenstreit, VA3KO
----- Original Message -----
From: "Hardy Landskov" <n7rt@cox.net>
To: "Fuqua, Bill L" <wlfuqu00@uky.edu>; "Jack Taylor" <jack@n7oo.com>;
<amps@contesting.com>
Sent: Monday, January 27, 2014 5:58 PM
Subject: Re: [Amps] Tube swap
In addition to Bill's list, it will take about 30 to 40% more drive. Been
there, done that.
GL Hardy N7RT
----- Original Message -----
From: "Fuqua, Bill L" <wlfuqu00@uky.edu>
To: "Jack Taylor" <jack@n7oo.com>; <amps@contesting.com>
Sent: Monday, January 27, 2014 1:57 PM
Subject: Re: [Amps] Tube swap
Yes and no.
1. The 4-1000A is taller so the chimney may not fit.
2. The 4-1000A in grounded grid will require more plate voltage to
achieve the same output.
3. The input impedance of the 4-1000a is a bit higher so you may have to
make some changes to your input matching ckt.
4. The control grid pin needs to be grounded as well as screen grid
pins.
5. The output Z of the 4-1000A is higher but not so much that most
plate tank circuits can't deal with it.
73
Bill wa4lav
________________________________________
From: Amps [amps-bounces@contesting.com] on behalf of Jack Taylor
[jack@n7oo.com]
Sent: Monday, January 27, 2014 3:51 PM
To: amps@contesting.com
Subject: [Amps] Tube swap
Am in the process of bringing back to life a RF 102A. Should the
3-1000Z
turn out to be defective, can I directly
interchange it with a 4-1000A?
Jack - n7oo
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