Scott 299A Schematic

Mike K2 · 15th March 2007, 12:56 AM

Does anyone know where I can get a legible schematic for my Scott 299A?

I printed a Sam's Photofact from the HH Scott website and found several errors in it. I found another that is a scan of an actual HH Scott schematic, but the scan is so poor that many of the component values can't be read. Are any legible actual HH Scott schematics available? Or any other accurate and legible 299A schematics?

A legible parts list would be wonderful too.

Thanks

kevinkr · 16th March 2007, 07:53 PM

How serious are the errors? I unfortunately don't know where my old schematics are at this point, but Scott was somewhat notorious for making subtle or not so subtle design changes and not documenting them well.. It is possible that the unit Sams used was slightly earlier or later than your unit, but most of the information should still be usable.

Mike K2 · 16th March 2007, 08:47 PM

The biggest descrepancy I saw on the Sam's schematic was the value of the bias resistor that is connected to the rectifier tube. It was listed as a 330 ohm 10W resistor whereas the Scott schematic and the actual unit have a 160 ohm 20W.

Wait! What is this? I just looked at the Sam's schematic and found another 330 ohm 10W in parallel. Boy do I feel humble now!

Still, there are differences that are disconcerting. They may simply be another way of accomplishing the same thing like the bias resistor change, but I lack the education to make educated guesses when it comes to electronics. A clear copy of the actual HH Scott schematic would be great to have.

jkeny · 16th March 2007, 09:04 PM

Hi Mike,
Here's a site, I found today, which has a slew of schematics including a lot of the Scott, Fisher, Dynaco amps. Funnily, the 299a is listed & should have a schematic link but it's not working. Maybe the other Scott amp circuits are similar & could help you.

John

Edit: forgot site URL: http://www.one-electron.com/FC_Consumer.html

Tom Bavis · 16th March 2007, 10:26 PM

299 (Sams) schematic is at hhscott.com:

http://hhscott.com/pdf/sd/299A_3_4s.JPG

Scott schematic is at

http://oldtech.net/HHScott/299.gif

I don't know if there WAS an "A" model... both just show "299", no "A".

Mike K2 · 17th March 2007, 11:37 PM

jkeny- That's really too bad that the link doesn't work for the 299. Looks like a great one for old tube stuff in general, though!

Tom- I printed out a scematic from the link that you suggested and while not 100% legible, it's way better than the one I had.

Thanks!

15th March 2007, 12:56 AM	#1
Mike K2 diyAudio Member Join Date: Aug 2004 Location: Indiana	Scott 299A Schematic Does anyone know where I can get a legible schematic for my Scott 299A? I printed a Sam's Photofact from the HH Scott website and found several errors in it. I found another that is a scan of an actual HH Scott schematic, but the scan is so poor that many of the component values can't be read. Are any legible actual HH Scott schematics available? Or any other accurate and legible 299A schematics? A legible parts list would be wonderful too. Thanks

16th March 2007, 07:53 PM	#2
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	How serious are the errors? I unfortunately don't know where my old schematics are at this point, but Scott was somewhat notorious for making subtle or not so subtle design changes and not documenting them well.. It is possible that the unit Sams used was slightly earlier or later than your unit, but most of the information should still be usable. __________________ www.kta-hifi.net

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16th March 2007, 08:47 PM	#3
Mike K2 diyAudio Member Join Date: Aug 2004 Location: Indiana	The biggest descrepancy I saw on the Sam's schematic was the value of the bias resistor that is connected to the rectifier tube. It was listed as a 330 ohm 10W resistor whereas the Scott schematic and the actual unit have a 160 ohm 20W. Wait! What is this? I just looked at the Sam's schematic and found another 330 ohm 10W in parallel. Boy do I feel humble now! Still, there are differences that are disconcerting. They may simply be another way of accomplishing the same thing like the bias resistor change, but I lack the education to make educated guesses when it comes to electronics. A clear copy of the actual HH Scott schematic would be great to have.

16th March 2007, 09:04 PM	#4
jkeny Banned Join Date: Feb 2007 Location: Dublin	Hi Mike, Here's a site, I found today, which has a slew of schematics including a lot of the Scott, Fisher, Dynaco amps. Funnily, the 299a is listed & should have a schematic link but it's not working. Maybe the other Scott amp circuits are similar & could help you. John Edit: forgot site URL: http://www.one-electron.com/FC_Consumer.html

16th March 2007, 10:26 PM	#5
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	299 (Sams) schematic is at hhscott.com: http://hhscott.com/pdf/sd/299A_3_4s.JPG Scott schematic is at http://oldtech.net/HHScott/299.gif I don't know if there WAS an "A" model... both just show "299", no "A".

17th March 2007, 11:37 PM	#6
Mike K2 diyAudio Member Join Date: Aug 2004 Location: Indiana	jkeny- That's really too bad that the link doesn't work for the 299. Looks like a great one for old tube stuff in general, though! Tom- I printed out a scematic from the link that you suggested and while not 100% legible, it's way better than the one I had. Thanks!

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