[Amps] TL922 QSK mod
r at somis.org
Fri Apr 9 03:25:30 EDT 2004
On Apr 8, 2004, at 10:20 AM, Paul B. Peters, VE7AVV wrote:
> I'm getting ready to do the QSK mod on a TL922 amp.
> The amp has already had most of the well documented modifications=20
> by AG6K / others) and changes made --- QSK is all that remains to be
> done. I would be interested in hearing from others who have performed
> the QSK mod to this amp with any tips, suggestions or ideas they may
> have discovered in the process.
=F0 A good place for the HS relay(s) mtg bracket is the space where the=20=
original RF relay was (relay saved for step-start). A good place for=20
the ECBS is near the zener diode (which is removed). The zener diode =20=
heatsink can be used for mtg Q1 (TIP-33) the cathode bias switch. The=20=
rest of the ECBS components can be mounted on an adjacent long, thin=20
strip of perfboard. RF connections to the vacuum relay should be made=20
with an S-shaped link of soft copper foil in order to minimize sound=20
conduction to the chassis.
- cheers, Paul
> 73 de Paul, VE7AVV
> StoneyGround Station
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Rich Measures, AG6K, 805.386.3734. www.somis.org/
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