| Brand | George Philbrick Researches INC. |
|---|---|
| Type | Operational Amplifier (Tube) |
| Model | K2-B |
| Country of Origin | United States |
Check the listing for details. Rare New boxed George Philbrick Booster Current Amplifier GAP/R Model K2-B. Condition: New, Made in United States. Listed at 125.00 USD. Very Rare New Unused George Philbrick Vacuum tube Operational Amplifier GAP/R Model K2-B. This is a booster current amplifier used with K2-W or K2-X to increase the available current output.