Schematic/Parts list Difference

a 3W single ended EL84 amp for home, work & school

Schematic/Parts list Difference

Postby opa1 » Fri Nov 06, 2015 1:00 pm

On the Budgie, The schematic is showing R11,R12 @ 220K. The parts BOM is showing 475K R11,R12. Which one is correct?
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Re: Schematic/Parts list Difference

Postby battradio » Fri Nov 06, 2015 2:33 pm

Well both will work , a cathode biased 6Bq5 El84 both values are stable , the 470K ohm will give lower bass extension with the specified coupling cap and is spec'd in the RCA tube manual.
http://frank.pocnet.net/sheets/191/6/6BN11.pdf
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Re: Schematic/Parts list Difference

Postby opa1 » Fri Nov 06, 2015 2:39 pm

Thanks! This is the load resistance @ 4500 ohms correct?
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Re: Schematic/Parts list Difference

Postby battradio » Fri Nov 06, 2015 2:46 pm

look under max circuit value of first grid .47 meg ohm
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