IS THIS A REAL E810F ??? - diyAudio
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Old 7th April 2013, 06:08 PM   #1
el156 is offline el156  Portugal
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Default IS THIS A REAL E810F ???

HI ALL
Recently i bought a pair of E810F , but one of them looks a bit strange to me...it has marked E810F/7788 in one side and RCA and made in Holland in the other side...Rebranded or fake ?
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Old 7th April 2013, 06:12 PM   #2
el156 is offline el156  Portugal
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Default Another photo of the E810F

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Originally Posted by el156 View Post
HI ALL
Recently i bought a pair of E810F , but one of them looks a bit strange to me...it has marked E810F/7788 in one side and RCA and made in Holland in the other side...Rebranded or fake ?
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Old 7th April 2013, 09:06 PM   #3
lexx21 is offline lexx21  United States
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Looking at the datasheet, it appears to be real.

http://tubedata.tubes.se/sheets/009/e/E810F.pdf
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Old 7th April 2013, 09:25 PM   #4
kevinkr is offline kevinkr  United States
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I would suspect real as well, I have a number of these and have not yet seen anyone counterfeiting these - I guess they are still obscure enough that no one has thought to pass off phonies for profit.
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Old 7th April 2013, 09:57 PM   #5
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It may be a real E810F/7788 but I don't think RCA ever made that number. It isn't in any of their data books. Nor did any American manufacture. If it's from Holland it's probably Amperex. Phillips and Siemens also made them. I know the label is worn but it's still a sloppy job. Could have been done by one of the surplus resellers of days gone by. I could name names, but won't.
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Old 7th April 2013, 10:59 PM   #6
el156 is offline el156  Portugal
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It looks very strange for me a RCA tube ,made in holland, and printed in different colours...
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Old 8th April 2013, 12:27 AM   #7
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RCA did sell this tube, but did not actually make it. Manufactures around the world bought from each other. Then put their own brand on them which was perfectly legal. Notice the clean sharp lines on this "offical" RCA brand. Mullard also made them. Anyway, the 7788 is a very nice tube with lots of gain even in triode mode.
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Old 8th April 2013, 01:44 AM   #8
multi is offline multi  Australia
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Does Any one have some circuits for this tube as a triode? Or tried it out/
I have some E810f's to try out.
Thanks
Phil
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Old 8th April 2013, 10:11 AM   #9
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Default E810F

Hello! I had a look at my stock list, and found that these tubes had many manufacturers in europe. Miniwatt Dario RTC Mullard Philips Siemens Telefunken It's not surprising to see some of them rebranded by RCA. In europe, many RCA manufactured types were also rebranded with local brands. It was simply a bilateral commercial agreement. E810F were often used in oscilloscopes and other industrial equipments. By the way, in pentode mode, their gain is so huge that they are strongly prone to self oscillation. Use adequate design rules, even in triode mode, to avoid such bad surprises. For audio, E180F or 6J9P (Russian version) in triode mode SRPP really give fantastic results, and are much more stable and cheaper than E810F.
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Old 8th April 2013, 10:56 AM   #10
Kosmin is offline Kosmin  Europe
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I think this tube can be used to amplify low signal levels, like phono RIAA preamplifiers. There you can take advantage of its low noise capability and high gain.
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