[Boatanchors] GB> Is 4657 same animal as the 8072?

[Glen Zook]

The tube is just an RCA 8072 branded with Motorola's part number.  I have seen hundreds of these tubes when I owned the Motorola reconditioned equipment center for the south-central United States.  Starting in the mid 1970s Motorola usually just put 8072 tubes in the boxes marked with their part number instead of having them specially marked.

Glen, K9STH

Website:  http://k9sth.com


--- On Sun, 10/18/09, Scott Johnson <scottjohnson1 at cox.net> wrote:

If a 4657 looks like an 8072, it is probably a 26 V heater variant, or perhaps pulse rated, or some other difference. Also these tubes are not
> planar construction, they are coaxial.