Here are 12 used 6GH8 tubes from various manufacturers.
Test results are as noted below:

6GH8A, Sylvania, 80%/90%, 1900/2250:3000/4000Gm, used (ob) (m9), yellow lettering
6GH8A, RCA, 80%/90%, 2000/2250:3800/4000Gm, used (ob) (m9), red lettering
6GH8A, Westinghouse, 80%/140%, ---, used (ob) (m9), japan
6GH8A, Realistic, 120/120%, 3400/2250:5800/4000Gm, used leaky (1M) (ob) (m9), Holland
6GH8A, Ratheon, 90%/110%, 2600/2250:5000/4000Gm, used leaky (500k) (ob) (m9),
6GH8A, Magnavox, 95%/90%, 2700/2250:4700/4000Gm, used leaky (2M) (L) (m9), ---
6GH8A, Olympic, 85%/80%, 2600/2250:8000/4000Gm, used (L) (m9), 1/2 gray coat - japan
6GH8A, RCA, 80%/110%, 2000/2250:4800/4000Gm, used leaky (500K) (L) (m9), red lettering
6GH8A, RCA, 85%/80%, 2200/2250:3800/4000Gm, used (L) (m9), red lettering
6GH8A, RCA, 120%/110%, 2000/2250:4800/4000Gm, used leaky (1M) (L) (m9), red lettering
6GH8A, RCA, 80%/90%, 2200/2250:3900/4000Gm, used (L) (m9), red lettering
6GH8A, Amperex, 100%/100%, 3000/2250:5000/4000Gm, used leaky (500K) (L) (m9), France
6GH8A, Sudenor, 125%/140%, 2900/2250:4700/4000Gm, used leaky (100K) (L) (m9), Canada
6GH8, RCA, 100%/90%, 2800/2250:4800/4000Gm, used leaky (500K) (L) (m9), red lettering

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