>Date: Wed, 29 Sep 2010 20:49:08 -0500 >From: "Curt" <[email protected]> >Subject: Re: [Drakelist] 6JB6 vs.6JB6A >To: <[email protected]>
>I'll never again buy vacuum tubes off of the internet, after buying from a >regular "store" on the auction site two "matched" 6JB6s, both soft as >pillows and useless above 40M. Of course, everything there is always >"as-is". I'll also never buy anything from a big tube seller in Florida >who >is a small-time liar and crook. Only bonafide companies for me, the >products are no more expensive, and at least its a big outfit ripping me >off. >Good to know that a 6GJ5 is equal to a 6JB6, surprised had never read that >before. Unfortunately, maybe most tubes sold are pretty much worn out. >Even most of the companies selling tubes draw the line at providing much >warranty for sweep tubes ( 10 days conditional from the outfit I use a >lot ). >Curt KB5JO ------------------------------------------------------------------ A 6GJ5 is not quite equivalent to a 6JB6. There is a pin difference. That caused problems with National transceivers such as the NCX-5 and the NCX-3 that used 6GJ5's. The 6GJ5 internally ties its suppressor grid to the cathode, the 6JB6 does not. The Nationals used one base pin as a tie point, that had to be separated out when tube types were swapped. Since I don't know how the Drakes are wired, I'm not sure if a similar problem exists. There are other minor differences between the tubes. 73, Doug/WA1TUT _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
