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Re: need help with the ella

168.100.204.207

hey! Your readings are looking good now. The 6.3VAC heater is okay to be +/- 10% or so. This will change a little as your mains voltage varies from time to time (normal).

250mV for the bias just means that it is biased on the low side now (25mA). The next step is where you adjust the bias pots to make them all read the same number. 0.45V (45mA) is suggested for el34s, 6550s could go higher, but I won't get into that now. It should play music at 25mA bias though.

I have the power safety ground connected to the chassis near the IEC connector. The signal ground should be connected only to the main PCB, IIRC. (wire goes from RCA jack ground to the GND on the PCB). So while they are not directly connected, they do both connect to the chassis at different points. This arrangement keeps hum from being picked up on the input. If you get lots of hum, you could try leaving the saftely ground unconnected.

I think you can safely try it out now with all the tubes inserted. Let us know how it goes or of any other problems that come up.

-zarni



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