HP5061A tube question
Hi,
The tube is in a vacuum so the ovens heat only has roundabout physical
paths to get to the outer case. If the tube feels warm at all at both
ends the oven and hotwire are probably working OK.
If you have a T type thermocouple temperature meter you can connect it to
the copper and silver wires coming out of the potting and measure the
ovens temperature directly.
Another way is to let the unit warm up for an hour or so, remove power,
and then quickly remove the tubes connection to J16.
Then hook an ohmeter from pin 9 of the removed cable to chassis ground.
This is measuring the oven thermistor value and should be close to the
value on the tubes label.
If that is OK then I'd recommend performing the low frequency test
outlined in the manual. This will help determine if the tube is gone or
not.
Whereabouts are you located?
Corby Dawson
Sweepstakes!!!
Enter for your chance to WIN a summer spa getaway!
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Thanks.I'll Try Your Suggestions.I'm In Schertz Texas.> To: time-nuts@febo.com> Date: Mon, 30 Jun 2008 09:31:34 -0700> From: cdelect@juno.com> Subject: [time-nuts] HP5061A tube question> > Hi,> > The tube is in a vacuum so the ovens heat only has roundabout physical> paths to get to the outer case. If the tube feels warm at all at both> ends the oven and hotwire are probably working OK.> > If you have a T type thermocouple temperature meter you can connect it to> the copper and silver wires coming out of the potting and measure the> ovens temperature directly.> > Another way is to let the unit warm up for an hour or so, remove power,> and then quickly remove the tubes connection to J16.> Then hook an ohmeter from pin 9 of the removed cable to chassis ground.> > This is measuring the oven thermistor value and should be close to the> value on the tubes label.> > If that is OK then I'd recommend performing the low frequency test> outlined in the manual. This will help determine if the tube is gone or> not.> > Whereabouts are you located?> > Corby Dawson> ____________________________________________________________> Sweepstakes!!! > Enter for your chance to WIN a summer spa getaway!> http://thirdpartyoffers.juno.com/TGL2141/fc/JKFkuJi7Ujj5Y6Jd6H3JwcutoE5NToavXQ611tmhu7h03vCqu38rRH/> > _______________________________________________> time-nuts mailing list -- time-nuts@febo.com> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> and follow the instructions there.
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Also, check the Cs oven meter reading. If it's zero, the heater
controller/heater/thermocouple is suspect. Normally, when you turn the
unit on, the Cs oven will read up near the top of scale, gradually
declining as the oven warms up. Mine goes down to about 10 steady-state.
If it's doing this, your heater is OK.
Another possibility is a dead -2500V HV power supply. If you have a
manual, there's a way to check that without an HV meter. If not, let me
know and I can write up the procedure for you.
If you decide the unit is permanently dead, I need some spares for mine;
I'd be willing to talk price for it. (I have a sometimes-flaky
synthesizer I haven't bothered to troubleshoot, and I've rebuilt the
crystal oven twice)
Bill Ezell
They said 'Windows or better'
so I used Linux.
ron hunt wrote:
Thanks.I'll Try Your Suggestions.I'm In Schertz Texas.> To: time-nuts@febo.com> Date: Mon, 30 Jun 2008 09:31:34 -0700> From: cdelect@juno.com> Subject: [time-nuts] HP5061A tube question> > Hi,> > The tube is in a vacuum so the ovens heat only has roundabout physical> paths to get to the outer case. If the tube feels warm at all at both> ends the oven and hotwire are probably working OK.> > If you have a T type thermocouple temperature meter you can connect it to> the copper and silver wires coming out of the potting and measure the> ovens temperature directly.> > Another way is to let the unit warm up for an hour or so, remove power,> and then quickly remove the tubes connection to J16.> Then hook an ohmeter from pin 9 of the removed cable to chassis ground.> > This is measuring the oven thermistor value and should be close to the> value on the tubes label.> > If that is OK then I'd recommend performing the low frequency test> outlined in the manual. This will help determine if the tube is gone or> not.> > Whereabouts are you located?> > Corby Dawson> ____________________________________________________________> Sweepstakes!!! > Enter for your chance to WIN a summer spa getaway!> http://thirdpartyoffers.juno.com/TGL2141/fc/JKFkuJi7Ujj5Y6Jd6H3JwcutoE5NToavXQ611tmhu7h03vCqu38rRH/> > _______________________________________________> time-nuts mailing list -- time-nuts@febo.com> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> and follow the instructions there.
Need to know now? Get instant answers with Windows Live Messenger.
http://www.windowslive.com/messenger/connect_your_way.html?ocid=TXT_TAGLM_WL_Refresh_messenger_062008
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