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Old 20th May 2019, 7:43 pm   #11
OldTechFan96
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Join Date: Jul 2017
Location: Newcastle Upon Tyne, Tyne & Wear, UK.
Posts: 1,177
Default Re: Hameg HM307-3 Cleaning and Repair

Thanks wme_bill. I will try a pair of BF256s as they are available locally.

I've been measuring the voltages on the BF458s in the final Y amp and they are all wrong!

What they should be:

E- 14.5V. C- 87.5V. B- 15V.

What they are:

T123: E- 20V. C- 47V. B- 21V
T124: E- 17V. C- 136V. B- 8V

I've pulled them and tested them with my DMM and don't show up as faulty.

Any ideas as what to do next?
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