Hej!
Your diode in the + 110 volts relay supply is probably shorted. Do not
forget to
replace the electrolytic condenser in that supply if so. Is it not strange
that those SB 220s still run years after years usually without problems.
Surprising, because that receiving type switch in the output pi filter is
really weak and I did not expect my 1969 (or was it 1970? ) built still
running well after 30 years. The first in Sweden - had graphite anodes .
Prosit de Hans
----------
----------
>Från: measures <measures@vcnet.com>
>Till: <JSheinb785@aol.com>, "AMPS" <amps@contesting.com>
>Ämne: [AMPS] Re: SB220 problem
>Datum: ons 10 nov 1999 16.03
>
>
>>When my Kenwood TL922 quit, I pulled out my trusty(?) SB220, which has been
>>sitting under my radio bench for a number of years, put it in place, & tried
>>to tune it up. However, I couldn't get any output from it although the
>>antenna relay clicked. High voltage in the CW/tune position is 2700V. When
>>I turned the switch to grid current the needle pins all the way.
>>Anyone with suggestions?
>
>Install glitch diodes to protect meters.
>Remove +110vdc from relay's bias contacts to prevent shorted tube from
>destroying fil. transformer. .
>Install glitch R in hv positive lead.
>If your 0.82 ohm grid current shunt is open, chances are you have a gassy
>tube, or you had an internittent parasitic oscillation. To find out
>which, it takes a high.-pot. tester.
>
>good luck, Joe
>
>- Rich..., 805.386.3734, www.vcnet.com/measures.
>
>
>--
>FAQ on WWW: http://www.contesting.com/ampsfaq.html
>Submissions: amps@contesting.com
>Administrative requests: amps-REQUEST@contesting.com
>Problems: owner-amps@contesting.com
>Search: http://www.contesting.com/km9p/search.htm
>
>
--
FAQ on WWW: http://www.contesting.com/ampsfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|