Jeffery JacksonCustom GM-70 CopperMesh mono's, SRAusedJeffery Jackson Custom GM-70 CopperMesh mono's, SRA((( Pending Sale ))) One of the finest pairs of single ended Tube mono blocks made with the very sought after SRA stands: Experience Music: (Jeffrey Jackson) "as new" /// custom GM-70 Copper Mesh...27000.00

Jeffery Jackson Custom GM-70 CopperMesh mono's, SRA [Expired]

no longer for sale

((( Pending Sale )))

 One of the finest pairs of single ended Tube mono blocks made with the very sought after SRA stands:

Experience Music:  (Jeffrey Jackson) "as new" /// custom GM-70 Copper Mesh Tube Single-Ended Monoblock Amplifiers with SRA custom Ohio-Class XL+ isolation stands

     MSRP $80,000

     Asking $27,000

One of the finest amplifiers to be found and a best option for many of the best cost no object horn and high sensitivity speakers.

Here we have a great pair of beautiful “”as new” mono block Reference amplifiers designed to give you the purity and transparency of directly-heated triodes in a single-ended, ultra-high-purity circuit topology.  Designed and hand-built by Jeffrey Jackson, the legendary wizard behind Experience Music, these amps sound absolutely gorgeous on every type of music you can imagine.  When paired with high-efficiency speakers (e.g., horn-loaded speakers), the synergy and immediacy is quite remarkable.    
Although these units are actually less than 1 year old, and barely broken-in, the owner needs to sell them – along with the rest of his audio rig – due to a family medical situation that calls for rapid downsizing.  His loss gives you a once-in-a-lifetime opportunity to own the very best for barely one-third of the usual price!  Let’s face it, Jeffrey Jackson’s custom-designed and hand-built products just don’t show up on the used market very often.

Here are the key specifications for your consideration:

Single-Ended Amplifiers:

Monoblock dual chassis ­ walnut, steel, brass

Direct coupled circuit topology

Directly heated triode output tubes ­ copper plate GM70

Directly heated triode driver tubes ­ Valvo Aa

Nickel (Permalloy) driver transformers

Nickel (Permalloy) output transformers

Eight discrete choke input power supplies

866A Mercury output rectifier tubes

394A Mercury driver rectifier tubes

Nickel (permalloy) chokes

Silver internal wiring and connectors

Silver wired output transformers

Input impedance:  100K Ohms

Input Voltage:  120V

Power Output:  8 Watts per channel

Gain:  14 dB

The owner has meticulously cared for these amplifiers, so they are in extremely minty condition.  They have seen light use, and they have performed flawlessly -- no issues at all – although they have kept the owner up late at night listening to music when he should have been getting some sleep!  Just in case you are the worrying kind, the amps do come with a 20-year warranty.

Please note the amps also come with a beautiful pair of custom isolation stands made last year by Silent Running Audio.  These are the Ohio-Class XL+ stands, and they retailed for close to $6K all by themselves.  Following the SRA design philosophy, these were custom-made for the weight (and weight distribution) of the amplifiers, in order to insure that vibration would be nullified to the absolute maximum extent possible.  The stands have spikes on the bottom, but special “discs” are also included in case you prefer to, e.g., avoid scratching a wooden floor.

These beloved amplifiers will be very carefully packed for shipment.  The SRA stands will ship separately in their own dedicated wooden shipping crates.

Any questions, just ask!  Many thanks for looking.


Feel free to call with questions, I can be reached in my Los Angeles Audio & Video showroom weekdays (11-4PM) 310-472-8880 or after hours and weekends (10-10) on my cell 310-927-2260 or e-mail me directly at: [email protected]

Contact:  David Weinhart best to CALL with questions in Los Angeles Showroom from
11-4PM @ 310-472-8880 or my cell after hours and weekends from 10-10PM @
310-927-2260 or e-mail me directly at [email protected]     

For more information, visit my NEW & IMPROVED web site

It is best to call David Weinhart for great system design, support and expert system planning and maximizing your investment and creating the best sound possible !

Weinhart Design has lots of other items new and used and if you’re in Los Angeles or
visiting please accept my invitation to experience our World Class Audio Showroom (BY APPOINTMENT).

We are always interested in purchasing quality Audio, ESTATES & LP collections and most quality trades are welcome. It is best to call David see information below:

All sales out of California are California State Sales Tax exempt. California 9.5% State Sales Tax applies only for items picked up or shipped to a California address. 

We accept payments by Bank Wire Transfers without fees and is the only form of payment on all sales out of the U.S. and Canada. We prefer this method of payment, which also makes shipping to addresses other than billing agreeable. VISA, MasterCard and Paypal are gladly accepted within the U.S. and Canada as long as the
charge is approved and shipping to the billing address on record and adds 3% to cover costs. 

Please call me directly in my world class showroom in Los Angeles weekdays 11-4PM @ 310-472-8880 or on my cell including weekends from 10-10PM @ 310-927-2260 and I can answer your questions and help you with all of your new and pre owned needs. 

Making Audio Systems better 

    one system at a time,

         David Weinhart 
     Weinhart Design, Inc. 
        President & CEO 

e: [email protected] 

 The Audio and Video Expert 
2337 Roscomare Road, Studio #1 
  Los Angeles, California 90077 

    Showroom) 310-472-8880 
         Cell) 310-927-2260


member since February 2006

Weinhart Design  Verified Dealer

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