Here are five used 1644 twin pentode power amplifier tubes.
The 1644 is a special version of the 12L8 tube.
All are from RCA.
They are used but still have strong readings.
See test results below.

1644, GT, RCA, used, twin pentode power amplifier, 100%/120% emission, 2200/2700:2150 Gm
1644, GT, RCA, used, twin pentode power amplifier, 110%/120% emission, 2500/2700:2150 Gm, broken locator pin
1644, GT, RCA, used, twin pentode power amplifier, 120%/110% emission, 2600/2500:2150 Gm
1644, GT, RCA, used, twin pentode power amplifier, 120%/100% emission, 2800/2500:2150 Gm
1644, GT, RCA, used, twin pentode power amplifier, 120%/130% emission, 2600/3000:2150 Gm

How To Order:

Purchasing our bargain bin packs is easy.
Just send us an email indicating the bargain pack(s) you want (use the [item] number).
We will let you know the total price including shipping and handling.
Please see the Shipping and Handling link for ordering, payment and shipping details.

Contact MDB Ventures
sales@mdbventures.com
or
sales@fourwater.com