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EXPIRED - FOR SALE: Mjolnir Audio Electrostatic (Stax) HEV90/Aristaeus Type Amp (RK40 pot)

Item #649352393
Info: Mjolnir Audio Electrostatic (Stax) HEV90/Aristaeus Type Amp (RK40 pot)

Asking Price:
USD $1415.20
Retail Price: USD $2000.00
Payment method: Paypal
Ships to: Canada, United States
Shipping weight: 6.80 (kg) Calculate Shipping
Shipping Dimension: 50.80cm x 45.72cm x 40.64cm
Condition: 5 - Average (?)
Date Posted: Oct 31, 17 6:42am (PST)
About Seller: TX, United States
Product Brand: Mjolnir Audio
Days in System:180

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A very rare, maybe one of a kind utilitarian looking great amp, bought from Spritzer in April 2013. Description from Spritzer, as can be viewed at the listing from which I purchased it.

Another one of my DIY amps, this one was built as a play on the HEV90 and Aristaeus design. A friend wanted to build one of these so I naturally had to show moral support... [​IMG]

It is mostly similar to the Aristateus but I changed the tube types a bit. The Aristaeus and HEV90 use ECC83 driver tubes which I kept but they also use four ECL86 for the output stages. These are combo tubes, with one small triode and one larger pentode in the same glass envelope. Now these are becoming rare so I looked for alternatives and found the 6CM7. It has two triodes in the same envelope, one high gain and low power, the other lower gain and higher power/voltage. It is a nice tube and makes for a very nice amp. It has slightly lower over all gain compared to the stock amp but a normal 2Vrms source will have no problem getting it to very loud levels.

The amp is all wired point to point with good quality parts and uses the super rare Alps RK40 for a volume control. The power supply is similar to that used in the Aristaeus. The amp has two outputs, one Stax on a genuine Stax socket and a HE90 output using the correct socket. Both have the correct bias voltages and ballast resistors for each output. Same input sockets used as on the Aristaeus and the input wiring is mil-spec silver in teflon.

Only issues with this build is me messing up the front panel when doing the laser etching and the transformer hums a bit. Some do and some don't so nothing I can do about that. I like to mention everything like this though.


Asking price is exactly what I paid for it with shipping and is net to me (shipping and transactional fees, if any, paid by buyer). It is firm as it is a steal at this price with the price trend of electrostatic amps and the RK40 is almost worth the price of admission alone. It does lack the polish of recent builds, but it is a tank. I like it a lot with the SR-007 and friends have loved it with their Lambda's. I think it would pair well with the L700.

This ad was originally posted on US Audio Mart US Audio Mart and the seller ships to Canada, and the United States.


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