[Elecraft] BHI HP-200 and other headphones

[OE5CSP-Chris]

Hi Chris,

The K3 headphone amp (National LM4811) is specified at 106dB S/N ratio so
should be pretty noiseless.
Using Sennheiser HD600's here with quite high sensitivity which has no
noticable noise on the K3.
Does the hiss remain with AF gain all the way down?

A quick & dirty way to lower the residual amp noise is a small resistor
network is series with the headphone output. Not so elegant but might save
you from buying yet another headphone...

73'
Paul
PD0PSB


Hi Paul,

The hiss remains even with the AF gain all the way down! The front panel
connector is worse than the rear connector, so I always connect the Yaesu FH
77 STA to the rear connector. Could you please tell me how to build the
series resistor network? 

73, Chris-OE5CSP
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