EL84 Amp - Baby Huey - Page 36

gingertube · 16th November 2007, 05:09 AM

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

athos56 · 16th November 2007, 07:03 AM

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

cbutterworth · 20th November 2007, 05:03 PM

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

athos56 · 21st November 2007, 12:00 AM

Sorry to hear about your dog

Pets are like family, hope he pulls through.

cbutterworth · 21st November 2007, 04:28 PM

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

albertli · 1st February 2008, 08:22 PM

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

albertli · 3rd February 2008, 01:50 AM

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

Shoog · 3rd February 2008, 11:06 AM

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

gingertube · 4th February 2008, 02:49 AM

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

albertli · 5th February 2008, 06:11 AM

Guys,
Thanks

16th November 2007, 07:03 AM	#352
athos56 diyAudio Member Join Date: May 2006 Location: Yakima, Washington	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

21st November 2007, 12:00 AM	#354
athos56 diyAudio Member Join Date: May 2006 Location: Yakima, Washington	Man.. Sorry to hear about your dog Pets are like family, hope he pulls through.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Red Light District/Baby Huey (EL84 P-P) Output Iron	dsavitsk	Tubes / Valves	3	14th February 2009 01:21 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

20th November 2007, 05:03 PM	#353
cbutterworth diyAudio Member Join Date: Oct 2006	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

21st November 2007, 04:28 PM	#355
cbutterworth diyAudio Member Join Date: Oct 2006	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

1st February 2008, 08:22 PM	#356
albertli diyAudio Member Join Date: Nov 2004 Location: Vancouver	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

3rd February 2008, 01:50 AM	#357
albertli diyAudio Member Join Date: Nov 2004 Location: Vancouver	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

3rd February 2008, 11:06 AM	#358
Shoog diyAudio Member Join Date: Aug 2002 Location: Eire	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

4th February 2008, 02:49 AM	#359
gingertube diyAudio Member Join Date: Oct 2004 Location: Adelaide South Oz	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

5th February 2008, 06:11 AM	#360
albertli diyAudio Member Join Date: Nov 2004 Location: Vancouver	Guys, Thanks