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Old 29th Jul 2017, 1:39 pm   #44
Heatercathodeshort
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Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 6,681
Default Re: Kolster Brandes RV 10 (Crown)

The test with the substitute transformer will prove that the line output stage is driving the output valve as it would with the correct transformer.
Obviously if the scan coils are S/C or there is anything loading the PRIMARY of the RV10 transformer this test cannot detect that as these components are out of circuit!

Knowing the KB chassis I would say by your remarks that the LOPT is faulty.

It's worth disconnecting all leads from the LOPT primary tags and run the test. This will definitely confirm a faulty LOPT if it is heavily damped with the PL81 anode glowing a dull red.

Hope this helps. J.

PS Did you get those crocodile clips from RS components? I like them!
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