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EL84 Push Pull Integrated Amplifier

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This EL84 amplifier is our new design. It is EL84 or 6BQ5 class AB push pull circuit. The input stage is a single 12AX7/ECC83 twin triode which is a very common tube as voltage amplifying stage in tube amp. For the phase inversion stage, we specially make use of a pair power pentode EL84 to achieve good dynamic range and speed. So there are 6 pcs. EL84 tubes in this amp.

The output stage of this amplifier operated in class AB. We made cathode bias circuit which added one cathode resistor for each EL84. The bias of EL84 tube is automatically adjusted with the change of plate voltage of EL84. Thus user doesn't need to adjust the bias of EL84 tubes. The advantages of the cathode bias circuit are able to keep working condition stable and protect tubes.

An externally hosted image should be here but it was not working when we last tested it.


EL84-EL84PP-22.jpg
 
How do I go about purchasing one?
regards
Rob

Dear Rob,

It is easy. If you have Paypal account, please transfer the amount through Paypal. When I receive your payment, I will deliver the amplifier to you via DHL according to your address provided. The price of this amplifer with tubes is USD390 and plus the freight charge, USD280. The total amount is USD670.

Thanks & regards,

Tony.
 
Hi Jon,

Eico HF12 and HF14 are class vintage mono blocks with very high performance. We don't have plans to build EL84 mono blocks due to high budget and demand of market, but we accept custom make. What we are interested now is to build small EL84 single end and small EL84 push pull for desktop with PC or small audio system at home.

Thanks,
Tony.

Hi,
Any plans to build mono blocks like the Eico HF12 or better and simplier the HF14 amps only in the future or maybe custom?
Best Regards,
Jon
 

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