Berning Company ZH230, Prototype
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| Condition | |
| Payment methods |  |
| Ships from | Burnsville, MN, 55337-1008 |
| Ships to | United States |
| Package dimensions | unspecified |
| Shipping carrier | unspecified |
| Shipping cost | |
 Average | Research Pricing |
Prototype Berning ZH230, stereo, 30 watt amplifier designed for use with loudspeaker loads ranging from 4 ohms to 16 ohms. This unit utilizes the same patented output tranformerless ZOTL technology and tube complement as the production model. For a detailed description of the amplifier, please refer to the Berning website at: http://davidberning.com/products/zh230
The input and driver tubes are changed in the following manner in order to set feedback depending on user requirements: Input Driver Feedback 12AX7 12AT7 normal feedback 12AX7 12AU7 a little lower feedback 12AT7 12AT7 a little lower again 12AT7 12AU7 lower again 12AU7 12AT7 lower again 12AU7 12AU7 lowest feedback Power tubes are the same as used in the Berning Quadrature Z amplifier, 33JV6. The amplifier is being sold with 4 - RCA 12AU7 Clear Top input/driver tubes providing the lowest feedback. The amplifier is being sold with 12 - 33JV6 power tubes, 4 in the amplifier + 8 NOS in boxes. The power tubes have 4 - Herbie's Audio Labs UltraSonic Rx-30 tube dampers. The circuit boards are isolated with 30 - Stillpoints CBI (circuit board Isolator) (retail $40.00/each) No manual is provided.
Will ship to domestic and international destinations. Packaging will be custom made for any destination as no packaging was provided when I purchased the amplifier. Payment via bank check or Paypal. No personal checks please. Paypal 3% fees paid by buyer. Please contact me with any questions.
Questions for the seller |
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| Interesting amp. How did you end up with the prototype? Is the circuit different from the production run? What is its age? And, who can/will service it (if needed)? Through industry associations I was exposed to Berning products in the early 2000's. I admire their design philosophy, sonic attributes and reliability. Over those years I also developed an association with the principals at the Berning company. In early 2009, I was offered by David the opportunity to purchase a hand-wired prototype of a new 30 watt stereo amp they were going to soon put into production. I purchased the amp and it has been the sole source of amplification in my system since that time. I also own and am keeping and using in my system a prototype Pre One preamplifier with phono. This amplifier has been totally dependable in the 9 years I have been using it. Over that time it's had one power tube failure. I noticed this failure one day the amp failed to come up. I had tubes on hand and replaced the failed tube. The amp came up right away and has been performing flawlessly ever since. Aside from being hand-wired, I am not aware that its circuit is in any way different from production units. David and another technician who resides in Indiana are available to service this amp and all other Berning products. Thank you for your questions. |
| Many thanks for the details. I am intrigues by this amp, but have one concern. My speakers are 86db 4 ohm and I am not sure the amp will work. I believe you would be putting about 40 watts/channel into your 4 ohm speakers. Whether or not you feel they would be driven sufficiently would be a purely subjective decision on your part. My speakers are 6 ohm of similar efficiency. I can drive them to mid 90db levels at the listening position in my 18x36x7.5 room with this amp. |
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