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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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It is currently 16 Sep 2019, 19:59

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PostPosted: 14 Apr 2019, 03:17 
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Joined: 13 Jan 2018, 21:33
Posts: 186
Location: australia
very nice amplifier. you should be proud that it’s out there somewhere playing music for someone’s pleasure. there are certain things i like about my pioneer sc1223 theatre amp such as the convenience of wifi, ethernet, internet radio etc, and the sound is respectable if not a little characterless compared to the tube amp. i’ve never opened it up but i read that it uses the ice power class d module. I’m looking forward to putting the tube amp back into service. I have tried using the preamp out from the theatre amp to drive the tube amp but there must be a mismatch as the sound is not quite right. i just use the iphone. if someone comes up with or knows of a good diy dac that has wifi, usb and ethernet capability and would match the tube amp, that might be worthwhile putting together.

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PostPosted: 14 Apr 2019, 06:03 
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Joined: 23 Feb 2017, 02:02
Posts: 544
Class d normally have low input impedance of 10k ohms


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PostPosted: 15 Apr 2019, 05:47 
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Joined: 13 Jan 2018, 21:33
Posts: 186
Location: australia
Just can’t find the specs of this amp at the moment but i seem to recall input impedance of 47 k and for the preamp-out impedance was quite low. there is a second preamp-out option with 2k or so impedance. For driving the 6sn7/300b i’m not sure of the significance but the sound isn’t so good.

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PostPosted: 25 May 2019, 22:56 
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Joined: 13 Jan 2018, 21:33
Posts: 186
Location: australia
Completed the re-wire loosely according to the monoblock vision of @suncalc and @mwhouston. Ran into some space issues and suboptimal layout as I stuck to what I had done for the old pcb amp. I will need to move things like the 5v regs around to get a better and neater layout. There's audible hum which sounds like double mains freq which I will keep at. Musically the sound is beautiful though. Early days but sounds like a big improvement compared to the settings used for the pcb amp. Thanks diy friends for the circuit and the diy site.

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