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kennyk · Post by **kennyk** » Fri Nov 28, 2014 12:53 pm

yes, it's because I dived in with a multimeter before the voltages had settled.

Both amps are behaving in the same way

These were built by Dr John, and I received them as they are now, minus choke and OPTX. I've fitted both and apart from the anode of the EF86 all the voltages check out.

JF-Audio · Post by **JF-Audio** » Sat Dec 13, 2014 8:54 pm

Nice job.

Greg · Post by **Greg** » Sat Dec 13, 2014 9:19 pm

Any update, Kenny?

Did you get it sorted?

kennyk · Post by **kennyk** » Mon Dec 15, 2014 5:00 pm

Yes I've finally got both working, with a great deal of help from John Caswell.

I've removed the battery bias and replaced with the capacitor/resistor between the cathode and ground.
I'd like to attempt to charge the NiCads but they're in a heatshrink shroud with 2 wires soldered to the + and -, and a bridge soldered between the + and - at the other end. I don't have any heatshrink to re-assemble the package which is making me hesitant to break it open.

Is battery bias a huge step in terms of sonic performance?

IslandPink · Post by **IslandPink** » Mon Dec 15, 2014 6:17 pm

In my opinion battery bias firms-up the low bass ( by taking out a time constant ) but the rest of the sound goes to hell . I'm sure there will be a few people offering the opposite opinion soon

audio-talk

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