I've got a 549 that the CRT is double peaking and I'm having trouble setting the backplate level to a level that will write successfully and not have the background filled in. I checked all LV voltages and ripple, and everything is in spec. Strangely it still has the original HV transformer. I made sure the HV didn't drop after an hour of run-time, so I don't think it's got a HV transformer problem.

So now I'm wondering if anybody has a 549 CRT that is good that I could purchase? I'm afraid I'm going to come up empty so I'm wondering if the procedure on KE5FX.com (http://www.ke5fx.com/crt.html) is worth trying or will I condemn the CRT totally as it works sort of okay in non-storage, but I'd like it to work in storage mode. Any thoughts on trying to restore the CRT?

Thanks,

Jay

Hi Jay!

I THINK I still have one. It'll be tomorrow before I can
look to be sure, but I believe that I have what you want.
I have what's left of a 549 here.

On 24 Jan 2022 at 18:26, RellikJM via groups.io wrote:

I've got a 549 that the CRT is double peaking and I'm having trouble
setting the backplate level to a level that will write successfully
and not have the background filled in. I checked all LV voltages and
ripple, and everything is in spec. Strangely it still has the
original HV transformer. I made sure the HV didn't drop after an
hour of run-time, so I don't think it's got a HV transformer
problem.

So now I'm wondering if anybody has a 549 CRT that is good that I
could purchase? I'm afraid I'm going to come up empty so I'm
wondering if the procedure on KE5FX.com
(http://www.ke5fx.com/crt.html) is worth trying or will I condemn
the CRT totally as it works sort of okay in non-storage, but I'd
like it to work in storage mode. Any thoughts on trying to restore
the CRT?

Thanks,

Jay

Kim Herron W8ZV
kim.herron@sbcglobal.net
1-616-677-3706



--
Kim Herron
W8ZV
kim dot herron at sbcglobal dot net

Kim,

That’s stellar! I was sure that it was a lost cause. Please take your time in checking.

On the rejuvenation side of things I’m wondering if using a curve tracer might be the way to apply pulses to the cathode while monitoring current allowing for a higher peak current to rejuvenate the cathode while reducing the chance of stripping the cathode completely as the collector supply is pulsating dc vs a current limited variable dc supply talked about on the KE5FX page.

Me again Jay,

I do have that CRT. Please send me a direct e-mail and
tell me where you are located. Shipping is going to be the
expense.

Back to you Jay!

On 24 Jan 2022 at 22:19, kim.herron@sbcglobal.net
wrote:

Hi Jay!

I THINK I still have one. It'll be tomorrow before I can
look to be sure, but I believe that I have what you want.
I have what's left of a 549 here.

On 24 Jan 2022 at 18:26, RellikJM via groups.io wrote:

I've got a 549 that the CRT is double peaking and I'm having

trouble

setting the backplate level to a level that will write

successfully

and not have the background filled in. I checked all LV voltages

and

ripple, and everything is in spec. Strangely it still has the
original HV transformer. I made sure the HV didn't drop after an
hour of run-time, so I don't think it's got a HV transformer
problem.

So now I'm wondering if anybody has a 549 CRT that is good that

I

could purchase? I'm afraid I'm going to come up empty so I'm
wondering if the procedure on KE5FX.com
(http://www.ke5fx.com/crt.html) is worth trying or will I

condemn

the CRT totally as it works sort of okay in non-storage, but I'd
like it to work in storage mode. Any thoughts on trying to

restore

the CRT?

Thanks,

Jay

Kim Herron W8ZV
kim.herron@sbcglobal.net
1-616-677-3706



--
Kim Herron
W8ZV
kim dot herron at sbcglobal dot net

Kim Herron W8ZV
kim.herron@sbcglobal.net
1-616-677-3706



--
Kim Herron
W8ZV
kim dot herron at sbcglobal dot net