- #H.H. SCOTT STEREO MASTER HEATHKIT DRIVER#
- #H.H. SCOTT STEREO MASTER HEATHKIT MANUAL#
- #H.H. SCOTT STEREO MASTER HEATHKIT FULL#
- #H.H. SCOTT STEREO MASTER HEATHKIT PROFESSIONAL#
- #H.H. SCOTT STEREO MASTER HEATHKIT FREE#
Thank you! Condition: Als Ersatzteil / defekt, Condition: Please read full description and see all photographs. Please ask for shipping cost to AK, HI and PR before placing your bid.
#H.H. SCOTT STEREO MASTER HEATHKIT PROFESSIONAL#
Since unit was not fully tested by a professional electronics technician, it is being sold As Is for Parts or Repair.Brand: HH ScottModel: Type 399Manufacture Year: 1960'sManufacture Country: U.S.A.Serial Number: 51190Tested: See description Overall Size: 6-1/8" H x 16" W x 13-3/4" DWeight: 30 lbs.Ship Weight: 36 lbs.Condition: Pre-owned NOTE: Due to size and weight, this unit cannot be combined and shipped with any other item.An additional shipping charge for residents of Alaska, Hawaii or Puerto Rico will apply. Unit was only audio tested with a turntable no sophisticated electronics or tube testing was performed. We played a few records through the unit and noted the right channel sounds strong and the left channel had a lower sound not equal when balance was centered. The unit is in fair condition for its age, but it does have the expected dings/scuffs/surface wear as seen in the photographs. Up for your consideration is this beautiful 1960's, HH Scott Stereo Master Type 399 stereo AM/FM tube amplifier. Versand nach: US und viele andere Länder,Īrtikelnummer: 353736046984 Vintage HH Scott Typ 399 AM/FM Stereo Master rohrenverstarker-Tube amp. 47 = 9.4mV.Artikelstandort: Campbell, California, US, by Ohms law, multiply 20mA X the value of the resistor to get the target voltage to adjust for. To do this you measure the voltage across the resistor and. You want to adjust for 20mA bias current.
Turn the power on, volume all the way down. Put the meter on Volts and connect the meter across one resistor. I think in this model the emitter resistors are hard wired to the output transistors, not mounted on the board. Then to adjust the bias, locate the emitter resistors for the output transistors. Adjust the center voltage so the case to the transistor is exactly 1/2 the supply voltage. On the other, it should be about 1/2 the supply voltage. On one of them, the case is at the power supply voltage. There are 2 output transistors for each channel. Turn the power on and put your meter on the 100V range, or if it's an autoranging meter, just put it on volts. Remove any covering over the output transistors, which are the large metal transistors mounted on the heatsink. Now you need to adjust the center voltage before you can adjust the bias. Measuring across the pots with an ohm meter, adjust them for minimum resistance. I could only find snap in so I have a test of my soldering and wirewrapping skills and the new caps while being the proper diameter are really shorter. Now I have to change the 2 main power supply caps. Neither him nor the factory did a good job cleaning their flux off so I did it for them (psdone.jpg) The farthest one off was a 47uf cap that measured 50uf which exactly what the schematic called for. 10 uf's read 17 100uf read 150 everything was at least 50% higher capacitance then what it was suppose to be. I checked all the old and new caps with my meter except for the 4700 caps (meter only goes to 2000) I was fooled by some of the old caps having a solid line on the positive side and the new caps having a solid line on the negative side. So I put the wires back on and soldered them since my wire wrapping skills have vanished. I ordered the caps from digi key, didn't go exotic but I did order audio caps.īiggest mistake, I removed some of the wire wrapped wires on the bottom.
#H.H. SCOTT STEREO MASTER HEATHKIT DRIVER#
I'm changing the electrolytic capacitors in the pre driver boards and the power supply board.ĭr Audio suggested that I change the adjustment pots so I did those too. Pictures from my 1st attempt at recapping a reciever. Most look clean but this unit was in a heavy smokers house judging by the knobs. It is a wire wrap unit, should I just solder all of those connections?
#H.H. SCOTT STEREO MASTER HEATHKIT FREE#
If anyone knows where I can find a better or free one I would appreciate it.
#H.H. SCOTT STEREO MASTER HEATHKIT MANUAL#
So far the only manual I can find for this unit is on ebay for 27 dollars. When you turn it on it takes awhile to actually start working and there are quiet pops, hisses and hum till it warms up and the same thing when you turn it off.īeing old I decided to replace the 2 5000UF 50 volt caps and fix the power plug since somebody soldered a cord onto it. Figured it would make a decent bench stereo for checking out other units. The main reason I picked it up was for all the different inputs. This is a HH Scott Stereomaster 387 Receiver. I'm getting cabin fever so thought I would do some tinkering on some gear I have laying around.
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