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What happened to my gain?  E130L SE amp issue
What happened to my gain?  E130L SE amp issue
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Old 11th September 2019, 02:20 PM   #1
kstagger is offline kstagger  United States
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Location: Grand Rapids
Default What happened to my gain? E130L SE amp issue

I had some extra Hammond 1627SEA output transformers, two power transformers, and two spare chassis sitting around so I built this amplifier but only one in monoblock form:

E130L SE Pentoden Amp von Armin Ohrem

The amp appears to have minimal gain, even less so than my DIY Aleph J. My Classe preamplifier - which has plenty of gain - has difficulties getting any volume out of the amplifier. Should I increase the 100K feedback resistor or ??

I know 86dB speakers and 10Ws aren't an ideal mix - but I was expecting something listenable and then running into clipping on peaks. But I'm not even getting that.
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Old 11th September 2019, 02:31 PM   #2
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina
Try shorting the 1KΩ resistor at the first pentode. Or bypass it with a large capacitor (500F).
Osvaldo F. Zappacosta. Electronic Engineer UTN FRA from 2001.
Argentine Ham Radio LW1DSE since 1987.
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