Re: {Collins} SK800B socket/ sk806 chimney



I will concur with Jerry. I do the output test of the tubes in the amp. My tester was designed to insure a safe insertion of tubes that were unknown or have been on the shelf for years. It eliminates the "gassy flashover" tubes from getting into the amp.

Yes, I agree you can't do that at 100 volts. This tester applies 3200 volts max to the plate. It also allow independent control of the filament so ceramic tubes can be run for a prolonged time without plate voltage to attempt to reactivate the getter. jm

---
John M. Mathis, M.D., M.Sc.

Chairman: Diagnostic and Therapeutic Radiology
Associate Chief of Staff: Education
Dayton VAMC
Professor: Radiological Science
Wright State Univ. Medical School





On 2015-11-05 22:32, Jerry wrote:
Hi Stan,

As I recall John's article, the basis wasn't to test transconductance but to test at proper plate voltage for gassy tubes that may arc if placed into your expensive amp. If passed then the best place to test safely for RF
function would be in the intended amp.

73 Jerry
K1JOS

-----Original Message-----
From: Collins [mailto:collins-bounces+jsternmd=att.net@xxxxxxxxxxxxx] On
Behalf Of Stanley M Miln
Sent: Thursday, November 05, 2015 8:52 PM
To: John M. Mathis, M.D., M.Sc.; Collins
Subject: Re: {Collins} SK800B socket/ sk806 chimney

 Hi Guys
Tube testers for Output Tubes I think is Pointless unless you are looking for a dead short or a open filiment. Just because the tube looks good at
DC does not mean it is going to work at  RF Frequencys.
                 Stan K6RMR

As has been discussed on the reflector I published an article about a
tube tester I made previously for 3-500 and 8877 tubes (A Tube Tester
for High Power Transmitting Tubes; April 2012, QST).

I am in the process of modifying the tester for 4cx1000a tubes and
need a socket and chimney to complete the project.

If anyone has a SK800B and SK806 chimney for sale (or is willing to
sell) please contact me off list (directly) with the information.

Thanks to all.  john, wa5fac

--
John M. Mathis, M.D., M.Sc.

Chairman: Diagnostic and Therapeutic Radiology Associate Chief of
Staff: Education Dayton VAMC
Professor: Radiological Science
Wright State Univ. Medical School
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