Tung-Sol 6550 Factory Matched Pair (Extremely Rare!)
Listing ID: lis9637j Classified
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Listed · 543 Views
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| Condition | |
| Payment methods |  |
| Ships from | Lakeland, FL, 33811 |
| Ships to | United States |
| Package dimensions | 8.0" × 6.0" × 4.0" (1.0 lbs.) |
| Shipping carrier | USPS |
| Shipping cost | $28.00 |
| Original accessories | Box |
 Average | Research Pricing |
This is very rare find, once in a lifetime!
Factory matched pair, very tight readings.
1958 date codes, black plates, triple mica construction.
One base is slightly lighter color brown, which is common in this era.
Plate current on the Maximatcher @ 400v \ -48 = 35.5mA \ 35.3mA
Hickok 600A Readings are very strong, proper test procedures for 6550 were done with care. 7000 is nominal on the Hickok
11,500 \ 11.250 Steady @ 6.3 Filament Voltage
11,500 \ 11,250 Steady @ 5v Drop
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