Tube ampl. for repair

azazello · 13th April 2010, 06:24 AM

Today my friend gave me for repair old, big, heavy tube PP amplifier H.H.Skott stereomaster pe lk 150
with 4 x 6550 & 2 x 7199 & 2 x 5A4, but I didn't find the schematic. Can You help me to find, please!? I'll use 2 x GZ34 and I will build new PS with new caps. /wiring, of course, is 3D!/. I understand the topology, but I need a voltage points.

Thanks in advance!

mosfetmaniac · 13th April 2010, 07:29 AM

Hi, found a thread with some info that could be useful.
Tube Nube - need advice on Scott LK150

azazello · 13th April 2010, 01:58 PM

Quote:

Originally Posted by mosfetmaniac

Hi, found a thread with some info that could be useful.
Tube Nube - need advice on Scott LK150

Thanks!!

Frank Berry · 13th April 2010, 05:00 PM

I own an HHScott model 299C integrated amplifier and a model 208 power amplifier.
They are good amplifiers. Due to the high cost of the 7199 tubes, I have replaced the 7199 tubes with 6U8 tubes. It's a simple modification and I have not detected a sonic difference. To perform the mod, you'll need to move the connections on three of the pins.

azazello · 13th April 2010, 05:21 PM

Thanks, Frank!

azazello · 07:33 PM

At last! New life and new sound from 1961 !! Almost the same HH Scot LK150, but....some different, new caps, new main transf. 220v, new tubes 6550, GZ34 and 7199, switch for main HV,
new connectors....with old resistors not very good modes and sound. I changed plate and cathode resistors according data diagram
of 7199,..... terrible works with Loftin' White! Now my friend is very ,very glad and happy, he didn't believe that this stuff work
amazing!

http://picasaweb.google.bg/azazello5...30995539434546
http://picasaweb.google.bg/azazello5...31694528387506

radiostar · 15th April 2010, 08:18 PM

Nice work!!! Congratulations!

mosfetmaniac · 15th April 2010, 09:25 PM

Dang!, wish I could find a bit of hardware like that to fix up in my part of the world.
Congrats!

azazello · 16th April 2010, 09:31 PM

SCOT's sound is very good....
Scott LK-150 StereoMaster Tube Amplifier Amp Vintage - eBay (item 250616471292 end time Apr-23-10 10:10:08 PDT)
but my SE 2A3 RCA sounding better IMHO!

13th April 2010, 06:24 AM	#1
azazello diyAudio Member Join Date: Aug 2008 Location: Bulgaria	Tube ampl. for repair Today my friend gave me for repair old, big, heavy tube PP amplifier H.H.Skott stereomaster pe lk 150 with 4 x 6550 & 2 x 7199 & 2 x 5A4, but I didn't find the schematic. Can You help me to find, please!? I'll use 2 x GZ34 and I will build new PS with new caps. /wiring, of course, is 3D!/. I understand the topology, but I need a voltage points. Thanks in advance!

13th April 2010, 07:29 AM	#2
mosfetmaniac diyAudio Member Join Date: May 2009	Hi, found a thread with some info that could be useful. Tube Nube - need advice on Scott LK150 __________________ all sorts of stuff

13th April 2010, 05:00 PM	#4
Frank Berry diyAudio Member Join Date: Sep 2003 Location: Midland, Michigan	I own an HHScott model 299C integrated amplifier and a model 208 power amplifier. They are good amplifiers. Due to the high cost of the 7199 tubes, I have replaced the 7199 tubes with 6U8 tubes. It's a simple modification and I have not detected a sonic difference. To perform the mod, you'll need to move the connections on three of the pins. __________________ Frank

15th April 2010, 07:22 PM	#6
azazello diyAudio Member Join Date: Aug 2008 Location: Bulgaria	At last! New life and new sound from 1961 !! Almost the same HH Scot LK150, but....some different, new caps, new main transf. 220v, new tubes 6550, GZ34 and 7199, switch for main HV, new connectors....with old resistors not very good modes and sound. I changed plate and cathode resistors according data diagram of 7199,..... terrible works with Loftin' White! Now my friend is very ,very glad and happy, he didn't believe that this stuff work amazing! http://picasaweb.google.bg/azazello5...30995539434546 http://picasaweb.google.bg/azazello5...31694528387506 Last edited by azazello; 15th April 2010 at 07:33 PM.

15th April 2010, 08:18 PM	#7
radiostar diyAudio Member Join Date: Apr 2009	Nice work!!! Congratulations! __________________ tubes.rs facebook.com/tubes.rs

13th April 2010, 05:21 PM	#5
azazello diyAudio Member Join Date: Aug 2008 Location: Bulgaria	Thanks, Frank!

15th April 2010, 09:25 PM	#8
mosfetmaniac diyAudio Member Join Date: May 2009	Dang!, wish I could find a bit of hardware like that to fix up in my part of the world. Congrats! __________________ all sorts of stuff

16th April 2010, 09:31 PM	#9
azazello diyAudio Member Join Date: Aug 2008 Location: Bulgaria	SCOT's sound is very good.... Scott LK-150 StereoMaster Tube Amplifier Amp Vintage - eBay (item 250616471292 end time Apr-23-10 10:10:08 PDT) but my SE 2A3 RCA sounding better IMHO!

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