• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Tube ampl. for repair

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azazello

azazello

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Joined 2008
#1
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!
 
#4
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.
 
#6
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/azazello52/Amplifiers#5460430995539434546
http://picasaweb.google.bg/azazello52/KVM#5460431694528387506
 
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