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Old 16th November 2007, 05:09 AM   #351
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This is the "Jessica" Amp - the tube rectified, choke input power supply, 6V6 version of the Baby Huey. There is a 2nd identical choke mounted under the chassis for the 2nd channel.

Cheers,
Ian
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Old 16th November 2007, 07:03 AM   #352
athos56 is offline athos56  United States
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Default Nice!

Looks great! but...How does it sound? I need to get a job so that I can build my amp, college doesn't pay well enough
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Old 20th November 2007, 05:03 PM   #353
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Athos56,

Thanks for the Excel file of parts and sorry for the delay in replying. I have family in town, as well as a nine-month old with an ear infection, and to top that, our five year old corgi blew out a disc in his spine. He was almost totally paralyzed in his back legs. Anyway, we have forked out $5K for MRI scan and emergency surgery - yesterday afternoon. There's no improvement this morning, but it's very soon after surgery. Anyway, this may nix the Baby Huey build. If our family dog survives, he'll also need some kind of re-hab as well. I suppose this is what happens when your dog is not just a dog but a family member

In the meantime, I'll begin some PSU modelling. I would like to go all tube as far as possible in my "new" amp, although it really may not be necessary.

Sheldon..... my trust in your calculations is 100% (it was at 99.9% before GingerTube replied!).


Charlie
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Old 21st November 2007, 12:00 AM   #354
athos56 is offline athos56  United States
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Default Man..

Sorry to hear about your dog Pets are like family, hope he pulls through.
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Old 21st November 2007, 04:28 PM   #355
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Athos56,

Thanks. We have heard from other dog owners who say that it can be a couple of weeks before there's any improvement after the kind of trauma and surgery that he has undergone.

I suppose that the patient will be wanting to listen to his favourite (only) dog CD on the Aikido preamp!

Charlie
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Old 1st February 2008, 08:22 PM   #356
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Ian,

I'm on the way to build you design. One question I have is that 16R resistor on bias block. We normally use anything 10W in the self bias schema, according to my math, 0.023w is what I need. Can I just simply drop a 1w into it.

Albert
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Old 3rd February 2008, 01:50 AM   #357
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Ian,

Would you also advise if I could replace the ECC83 to ECC99. I don't have ECC83 handy, but I have the ECC99 in the box and think it might work too. what else I should do to make it work.
Thanks
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Old 3rd February 2008, 11:06 AM   #358
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No definatley not, they are entirely different beasts. The ECC99 is a high current medium mu triode - suitable as a high grunt driver.
The ECC83 is high mu low current triode suitable as a high gain input preamp.
Not at all interchangable really.

Shoog
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Old 4th February 2008, 02:49 AM   #359
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albertli,
1 W for teh 16 Ohm current sense resistor is fine.
As Shoog says ECC99 is not suitable - it must be ECC83, 12AX7, ECC803S and variants.

Cheers,
Ian
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Old 5th February 2008, 06:11 AM   #360
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Guys,
Thanks
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