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RCA 845 - matched pair

RCA 845 - matched pair
RCA 845 - matched pairRCA 845 - matched pair
Price: $3,000.00
Item Number: 1015
Manufacturer: RCA
1 matched pair in stock
Description

The 1964 RCA 845 tubes in this precisely matched pair (2) have gray plates and bottom D getters. The metal bases have the RCA logo and matching date codes (64-39).

Testing

The Amplitrex AT1000 tests 845 tubes at 500 vdc plate, -50 vdc bias, expecting 100 mA and 3000 Gm. Under these test conditions this pair tested at 77.2 mA and 78.8 mA for current draw and 3060 and 3080 for Gm.

I also ran these tubes at high voltages and used the data sheet typical operating conditions listed on the data sheet (https://frank.pocnet.net/sheets/049/8/845.pdf) to establish test parameters more typical of real world circuits for this tube type: 1000 vdc plate, -145 vdc bias, expecting about 90 mA. Under these test conditions this pair tested at 86.6 mA (96.2%) and 84.7 mA (93.9%).

I ran these tubes for over 20 minutes on the test fixture and they were perfectly stable. Very nice tubes.


Pricing

Price is for a matched pair and includes testing and matching service. Tubes ship in their original boxes with test results.
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TC Tubes specializes in precision testing and matching of vintage and new production vacuum tubes for guitar & bass players, audiophiles, and DIY tube audio enthusiasts. Our website features secure payment options and fast, convenient shipping around the world.

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