For sale a matched pair, rare 6550 tubes , Tung-Sol brand , made in USA.
The tubes are pristine , NOS, the original boxes opened first time by me just for checking.
These are the early version , with black plates , no holes , and triple getter.
All have similar factory codes 3226025-3, (early version 1960)
Visible are near mint ..
Tested on my HICKOK 752 tester .
Buy it now or make offer
Please see carefully the photos are the actual items that will be sent
I ship the items between 1-2 working days after payment via paypal, as registered parcel, (with tracking number) .
Thanks for looking, Giannis..