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- Unavailable
Output Tubes
The large 6LF6 output tubes are not readily available -- few such
horizonatal sweep tubes are. The SA-4 does not have provisions for individually
adjusting the bias of each tube; instead, Counterpoint originally bought
these tubes in large quantities and matched them at the factory. There
are no replacement tubes suitable for use in this amplifier. Who knew
in 1984 that this amp would still be considered one of the most transparent
amps ever made?
Solution
Modify amplifier to permit individual adjustments for each output tube
to allow random 6LF6 tubes to be used. For the do-it-yourselfer, the
essential information is here. We can do
this work, too. See the SA-4 Upgrades Page for
information on the Alta Vista Audio SA-4 Bias Upgrade.
- Screen
Regulators Susceptable to Failure
Despite built-in current limiting, arcing in any output tube can
cause a screen regulator to fail.
Solution
Repair it. You can order a Service Manual and do it yourself or
send it to me. See Repair Service
- Lost
Fuseholder Caps.
These little square fuse caps are hard to find. Made by Littelfuse as
Part Number 348007. You can order them from Newark.com
as their Catalog Number 28F169 for $1.25 each.
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