Up for consideration…
Vintage Jackson Electrical Co.
Model 648A
Dynamics Tune Tester
This is 1940's - 1950's
Jackson Model 648A dynamic plate conductance tube tester
This tube tester was made by The Jackson Electrical Instrument Co. of Dayton, Ohio
This is a portable instrument housed in a wooden box covered with a now-tattered covering.
The box measures 16.5 inches wide, 13.5 inches deep and 6 inches high with the top closed
It is powered by regular household current with voltage ranging from 100 to 125 volts
The tester can test most 4, 5, 6, 7, octal 8, loctal 8, Noval, 9, miniature 7, and sub-miniature 7 and 8 pin tubes of the 1930's era and later
A roller tube chart list of tubes it can test is built in to the lower portion of the front panel
The operating instructions can be seen inside the lid in the photo
Powers on and meter needle moves
No further testing done
Please review all pics as they are a part of the description and what is being offered
Item sold "as is",
no return
so please review all pics and ask questions in advance of bid.
No international shipping
Payment must be received within three days of invoice
PayPal Accepted
If there is a problem that I did not mention in the listing, please contact me so that I can try to make things right.
Please give me an opportunity to take care of the issue instead of contacting eBay or leaving negative feedback.
I can’t help if I don’t know about the issue though. I want to provide excellent customer service.
If I should overlook something, it is not my intention to mislead you.
Thanks for looking and happy bidding!