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http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=1373782745they are actualy a GZ37 and surely they been reprinted U52 .
Follow Ups:
Is that tube going to fit in that box??
I don't quite understand what I'm hearing....
No, they are not fakes per se, they are misrepresented.They are NOT U52's, they are GZ33's - a much more common, much less expensive, and electrically different tube.
They are GZ37's. GZ33's are a tad shorter in length. (I've seen enough of them to distinguish between the two. The proportions look like those of a GZ37.) Although the internal plates are quite similar.The funny thing is the Mullard GZ37 (and GZ33) is *already* a premium tube- I think it would garner a higher price had it been sold as a GZ37. I do think the B+ is a little higher than a U52 or 5U4, so whoever wins this auction better be using it in a circuit that doesn't run anything at max B+ with a U52 or 5U4. (The GZ37 is an indirect-heated rectifier, where the 5U4 is a direct-heated rectifier.)
I've seen a plethora of 5AR4/GZ34's being sold as GZ37's on eBay as well...
The height of the bottle depends on the vintage.1950's GZ33's and GZ37's were a bit shorter. Later 60's and 70's production were taller, and had a different mica shape. But in both vintages, the GZ33 and GZ37 are identical in height - actually, they are virtually indistinguishable from each other - except that later production GZ33's had a slight greyish internal coating between the 2 top micas, and the two dark squares above the filaments.
The mica shape on Bugleman's auction pair tells us these are later production, consistent with the squares indicating these are GZ33's.
A NOS pair of real GEC U52 (and there are a horrible number of fakes, one idiot on Audiogon sells standard 5U4G's for horrible prices trying to say they are the equivalent of the U52) will go for between $160 and $200 on Ebay, while the GZ33 and GZ37 will fetch between $70 and $90 generally. But real U52's are distincive and quite rare, unfortunately, some of GEC's competitors were indiscriminately putting U52 on 5U4G's.
...or GZ33's . Whatever but they're used too ! Look carefully at the tops of the tubes . Brand new GZ's don't have little brown square darkening , after a few days use these appear after usage . A bit like the 'Mullard' KT88's that have appeared recently ....FB
The little dark squares are typical of NOS GZ33's, which is what I believe these are. For sure, they are obviously not U52's, it's very odd that he has Marconi boxes not marked properly. It is possible that these are legit rebranding by Marconi, but still, the seller is aware that these are not real U52's and should not be misrepresenting them.There will be no shortage of bidders going to a high price for these "rareties", though.
Hey-Hey!!!,
As to the seller, this seems to be a no brainer. On those dark spots, I've got a few IDH types that are definately new that show this same bit of getter spot right above the cathodes, it looks like this is what is going on here. I'd not recomend the Bugleman this just seems like another typical auctin for his 'NOS factory' ( that which creates NOS-ness )
regrds,
Douglas
It's not gettering , it's the characteristic darkening that happens with a lot of Mullard Valves with use . Trust me , I've sold dozens of GZ's before . Perhaps someone should pay Mr Bugleman with some $12.01 notes for a change !...FB
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