Read through most of the material - don't know if these price fixing practices would hold in the US.
One thing not mentioned is the labeling designation system instituted to further obfuscate tube designations for the purpose of stifling foreign competition. 13D1 and 6/30L2 are examples.
Upon further checking, although the WIZARD 6J5G has a similar concept/shape for the spacers with the visseaux/mazda 6J5G, but there are significant differences in the internal construction, i.e. different plate, supports, etc.
Edit: here’s some more related info from radiomuseum.org
“Wizard brand tubes were sold by the Western Auto Supply Co. in the late 1920's but the manufacturer is not known.
Also sold were Wizard brand panel lamps. The print style on these appears to be identical to the style used by General Electric, so this company could have made these lamps.”
Here is a GE 6J5GT tube. And I think that you are right - the Wizard tube I have looks very much the same.
Most of the US made 6J5GT tubes have a metal base and very few a black base.
Here is another methodology in identifying tubes, aside from scrolling through eBay offerings - Google images or just asking Google for pictures. On a few occasions I have been able to identify rebranded tubes this way and even find hard to get tubes for sale.
Here is a GE 6J5GT tube. And I think that you are right - the Wizard tube I have looks very much the same.
Most of the US made 6J5GT tubes have a metal base and very few a black base.
Here is another methodology in identifying tubes, aside from scrolling through eBay offerings - Google images or just asking Google for pictures. On a few occasions I have been able to identify rebranded tubes this way and even find hard to get tubes for sale.
Looking at the plates will help you. The GEC tubes never had round plates, they're always ladder-box style so if they have those wide oval type plates then they're STC/Brimar.
In search of the Tung Sol sound - a pair of TS 6C5GT tubes. One tube has no legible factory markings, the other one has a date code 9. Could it be 1939?
Dynamic and punchy sound backed by a pair of Chatham 6AS7G. Involuntary toe tapping is always a good sign...
Time goes - I think I paid less for these four tubes than the adapter.
Before this combination I tried a pair of RCA 12J5GT but I like the Tung-Sols better - very lively presentation.
In search of the Tung Sol sound - a pair of TS 6C5GT tubes. One tube has no legible factory markings, the other one has a date code 9. Could it be 1939?
Dynamic and punchy sound backed by a pair of Chatham 6AS7G. Involuntary toe tapping is always a good sign...
Time goes - I think I paid less for these four tubes than the adapter.
Before this combination I tried a pair of RCA 12J5GT but I like the Tung-Sols better - very lively presentation.
If I can ask the collective brain trust here about internal constructions (specifically by way of the top mica support. Who do you think made this (6J5G) tube? I've only got one answer so far from a tube collector whom I generally trust - but want to see if it aligns to what you all think. Thanks!
If I can ask the collective brain trust here about internal constructions (specifically by way of the top mica support. Who do you think made this (6J5G) tube? I've only got one answer so far from a tube collector whom I generally trust - but want to see if it aligns to what you all think. Thanks!
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