Is the Toshiba 2SJ201/2SK1530 pair (Mosfet) suitable for output stage ?

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alaskanaudio

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Joined 2001
audioamps.com
2Sk1530 and 2SJ201 and excellent combination

I have been using the 2Sk1530 and 2SJ201 combination in all my amplifiers for years. They are very fine performers when driven properly. I typically use 6ea 2SK1530 and 6ea 2SJ201 in each channel in a common source configuration.

I have a circuit diagram available of a amplifier I originally designed in 1992 that I used to have on my web site. This is a complex amplifier and not for those who believe totally in the keep it simple methods. It is likely not suitable for those starting out in this hobby. If anyone is interested I can put it back on my web site. I just need a little time to dig out the documentation. I have a limited number of circuit boards and the special power transformer available.

Johannes
 
peranders

peranders

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Joined 2002
sjostromaudio.com
Paid Member
It's an interesting amp and complex is the word :nod: I haven't taken the time to really investigate all cool features but it looks well-done. It would be fun to see a picture of this amp or at least the pcb layout.

I'll upload the schematics for a while at my place (a couple of weeks).

http://www.sjostromaudio.com/alaskan/alaskan_power_amp.pdf
http://www.sjostromaudio.com/alaskan/alaskan_component_side.pdf
http://www.sjostromaudio.com/alaskan/alaskan_solder_side.pdf
http://www.sjostromaudio.com/alaskan/alaskan_silkscreen.pdf
 
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alaskanaudio

Member
Joined 2001
audioamps.com
Mosfet Power Amp

PERANDERS I appreciate you making the schematic of one of my MOSFET power amps available on your web site. If desired I can supply the PCB layout for both the amplifier circuit board and the power supply/control circuit board.

It will take me a while longer to redo my own web site before it is useable again.

Johannes
 
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alaskanaudio

Member
Joined 2001
audioamps.com
Upupa Epops,

Thank you for the recommendation on the op amps used in the 1R1 power amplifier. This conversion from the 2604 parts to the 2134 parts was done a number of years back when those parts became available. The supply voltages to the IC's were also adjusted to a lower value to compensate for the lower voltage ratings of the 134 parts. The diagram posted does not reflect this change.

I’m attempting to get the latest files on my web site www.audioamps.com. The site is undergoing updates and is partially useable at the present time


Johannes
 
A

alaskanaudio

Member
Joined 2001
audioamps.com
Parts Available

Should anyone by sufficiently interested in building one of these amplifiers I still have circuit boards and power transformers available.

Part of the design work for this amplifier was to pulse test it into a 0.1 ohm resistor at full power repeatably with a pulse train. I cannot remember how long the pulse train was. Pulses were supplied by HP pulse generator and set to a width of 10ms. Supply voltage to the MOSFES runs about +/- 52 Volts. It is likely that you cannot do this with an amplifier that uses a minimal amount of MOSFETS in the output stage.

There may also be better OPAMPS available now but finding some that can run on the original +/- 24 Supplies can be difficult. Thus the supply voltages were dropped to +/- 18vdc. To drive the MOSFETS to full power does not require a lot of AC drive voltage but at higher frequencies does require considerable current since each MOSFET gate input has considerable input capacitance.
 
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