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-   -   EL84 Push Pull Integrated Amplifier (http://www.diyaudio.com/forums/twin-audio/164337-el84-push-pull-integrated-amplifier.html)

Musik007 2nd April 2010 06:11 AM

EL84 Push Pull Integrated Amplifier
 
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.

http://i30.photobucket.com/albums/c3...-EL84PP-20.jpg

http://i30.photobucket.com/albums/c3...-EL84PP-22.jpg

Musik007 2nd April 2010 06:15 AM

The voltage of this amplifier is 220V.
We make a special offer now, USD390.

http://i30.photobucket.com/albums/c3...-EL84PP-21.jpg

Musik007 2nd April 2010 04:15 PM

The dimension of this EL84 amplifier is 340Wx230Dx160H mm.
Net Weight: around 13 KG

Musik007 2nd April 2010 04:28 PM

Two signal inputs, 4 ohms and 8 ohms speaker outputs are available.

http://i30.photobucket.com/albums/c3...-EL84PP-14.jpg

http://i30.photobucket.com/albums/c3...-EL84PP-15.jpg

http://i30.photobucket.com/albums/c3...-EL84PP-16.jpg

Musik007 3rd April 2010 05:00 PM

Inside view of the EL84 PP amplifier:

http://i30.photobucket.com/albums/c3...-EL84PP-29.jpg

Musik007 8th April 2010 07:24 AM

CDET 0.33uF/630VDC (USA) capacitors are used for coupling and Philips BC 100uF/100V capacitors for cathode for EL84 tubes.

http://i30.photobucket.com/albums/c3...-EL84PP-31.jpg

Musik007 8th April 2010 07:27 AM

CDET 0.33uF/630VDC film capacitors perform stable and sound neutral.

http://i30.photobucket.com/albums/c3...-EL84PP-32.jpg

robmil 6th May 2010 04:20 PM

hi
 
How do I go about purchasing one?
regards
Rob

Cassiel 6th May 2010 04:25 PM

Musik007, you build beautiful amps. :up:

Musik007 6th May 2010 04:30 PM

Quote:

Originally Posted by robmil (Post 2177848)
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.


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