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Date Posted by Category

2009-11-10 (UTC)

KR4JA

HF Amplifiers

SB-220 with upgrades - Sold!

The cabinet has been painted flat-back, amp upgraded with: NEW RF Parts matched 3-500ZG tubes w/ 20 hours on them, measures soft start, new changeover relay, new 560uf 450v caps which are reverse voltage protected, new 3 amp 1000 piv rectifier diodes, new equalizing resistors, measures parasitic suppressors, 10 watt 15ohm ohmite resistor added for b+ protection, new 1000pf 7.5 kv caps, new input/output wafer switches, diodes for meter protection, input/output connectors, new 3 amp 1000piv diode string for bias, diode string installed for protection of the filament xformer, anti-reflective coating in tube compartment, new high output fan, new plate caps, stand-by switch added. Email for more inside pics. The higher HV capacitance allows this amp to run 3100-3200V on plate (depending on your line voltage) with low voltage drop on key-down. Non-smoking environment.
Prefer local (Atlanta Metro) pickup, $695.

This was marked by the originator on 2009-11-10 (UTC) as being sold.

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