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Old 26th Sep 2018, 3:10 pm   #13
Diabolical Artificer
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Join Date: Jul 2009
Location: Sleaford, Lincs. UK.
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Default Re: 120W PP EL34 amplifier re-born.

Ehm, that's an idea Chris, but the LM317AHV datasheet says it should be able to handle 2.2A. I've also had the problem with the heaters warmed and running for a while. the fault occurred yesterday when the IP signal was increased, in amplitude that is.

That's what I thought PJL, I tried different valves , both different ECC83 and 2's, no difference

Attached are some oscillogram's of said fault.

Andy.
Attached Thumbnails
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Name:	IP top OP bottom ECC83 B4 fault.JPG
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ID:	169916   Click image for larger version

Name:	start of fault.JPG
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ID:	169917   Click image for larger version

Name:	fault extremis.JPG
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ID:	169918  
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