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HH Scott A-436

Stereo Integrated Amplifier (1976-77)

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HH Scott A-436


Power output: 42 watts per channel into 8Ω (stereo)

Frequency response: 15Hz to 35kHz

Total harmonic distortion: 0.3%

Input sensitivity: 2.5mV (MM), 200mV (line)

Signal to noise ratio: 65dB (MM), 80dB (line)

Dimensions: 400 x 142 x 325mm

Weight: 10.5kg


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Reviewed Jun 17th, 2015 by

Bought one of these used. One channel did not work. No power to 2 power transistors. Looked very simple to work on. Recapped everything. Found one cap did not match schematic. The polarity on the cap (Main Power Board) was incorrect. Also many errors on the board made by Scott. Terrible inaccurate job of manufacturing the board. I was measuring different places on power board with respect to ground when it sparked and smoked a 1/2 watt 330 ohm resistor. One power transistor and several others and a few diodes on the board were taken out also. the heat sinks were hot and shut down unit. cannot seem to locate the transistors yet. Pioneer was much easier to work on and paid attention to details. what turned out to be a neat little amp is more like a search nightmare with no parts that I can find.



re: A-436

Got here by way of searching for info on a r336 receiver I bought(mistake)- no accurate or reliable specs or info out there! Has anybody ever saw a manufacturer allow 100mv DC on the speaker terminals before!? I can't get it down and neither could a reliable shop here in Chi. It sounds good but can't burn my tweeters up to crank it and can't sell it in good faith to a fellow vintage audio lover-Super frustrating trip this thing took me on! High DC seems a common theme on Scott SS stuff

re: A-436


DC offset is usually attributed to matching differential transistors for gain. In the 336 Service Manual these are Q801 and Q802 for one channel and Q811 and Q812 for the other. I doubt that the original transistors are still available, so you will probably need to substitute something like a 2SC2240 transistor. Also, is you haven't already, replace the feedback capacitor C803 and C814.


kameira's picture

re: A-436

i´m havimg the same problem ,when a friend came from holland and in transport the light´s of the power metters went off but ,worse than that one sound exit stoped working and i´m having difficulties trying to find the source of the problem the fuses are ok but the schematics i have ,don´t seem to match the boards i´ve found in the amplifier ,it also seems more powerfull than what they say in the spec´s ,about burning tweeters that never happened,the sound used to be clear and very versatille,what could be missing that made one output burn. This one was bought in Los Angeles,California in 78, regards from portugal

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