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Friday, October 8, 2021

The ELROG ER5Z3 Rectifier Tube


Yet another addition to the ELROG family, the ER5Z3!

Admittedly this was an easy one since the 5Z3 is electrically equivalent to the 5U4 except that it has a 4 pin UX4 base.

After the introduction of the ER5U4G, it was a small step to add this tube to the portfolio.

Best regards


Monday, October 4, 2021

Stereo Single Ended 45 amplifier


below some photos of a recently finished 45 amp.

It is a stereo amplifier with the power supply integrated.

This represents my entry level in amplification with the 45 tube.

Tube rectification with two 6AX4 TV damper tubes. A pair of 6N7 as driver tubes is interstage transformer coupled to the output tubes.

All transformers and chokes, except the main power transformer reside inside the chassis.

The two trim pots between the output tubes are hum buckers to minimise residual hum from the AC heated 45s.

This enables a hum free operation except on extremely sensitive speakers for which I would recommend the DC heated version of the 45 amps. On my 98dB speakers no hum whatsoever was audible.

Best regards