The Dynaco Tube Audio Forum

Would you like to react to this message? Create an account in a few clicks or log in to continue.
The Dynaco Tube Audio Forum

Dedicated to the restoration and preservation of all original Dynaco tube audio equipment - Customer support for Tubes4hifi VTA tube amp and preamp kits and all Dynakitparts.com products


3 posters

    Strange set of RCA EL34s. Any idea about the design?

    avatar
    ccarlton28


    Posts : 1
    Join date : 2022-08-04

    Strange set of RCA EL34s.   Any idea about the design? Empty Strange set of RCA EL34s. Any idea about the design?

    Post by ccarlton28 Sat Oct 01, 2022 3:30 pm

    My ST-70 came (old family friend was moving) with four of these RCAs.   They appear to be double halo but I can understand or have seen ones with the getter on the side.  

    Anyone have any knowledge of the story behind these types of el34s?
    Thanks.  
    ChrisStrange set of RCA EL34s.   Any idea about the design? Img_2014
    Strange set of RCA EL34s.   Any idea about the design? Img_2015
    Strange set of RCA EL34s.   Any idea about the design? Img_2013
    [url=https://servimg.com/view/20454403/5][
    avatar
    mijohn


    Posts : 111
    Join date : 2013-06-19

    Strange set of RCA EL34s.   Any idea about the design? Empty Re: Strange set of RCA EL34s. Any idea about the design?

    Post by mijohn Sun Oct 02, 2022 2:16 am

    From the Brent Jessee website:

    EL34 / 6CA7 RCA, GE, Sylvania, etc. "Fat Boy"

    The "Fat Boy" USA made tubes were produced primarily by Sylvania and GE. These have a much wider glass bottle, a black base, several round holes in the plates, and two large top getter rings set at an inverted "V" angle. The GE has the numbers etched into the glass, while the Sylvania used a dark grey paint with the words "USA" below. These "Fat Boy" tubes are very nice, and are still attractively priced. You will find them in RCA, Zenith, GE, Sylvania, Philips, Philco, and others, but they are all made by either Sylvania or GE.

    http://www.audiotubes.com/el34.htm
    avatar
    Jim McShane


    Posts : 236
    Join date : 2011-10-19
    Location : South Suburban Chicago

    Strange set of RCA EL34s.   Any idea about the design? Empty Re: Strange set of RCA EL34s. Any idea about the design?

    Post by Jim McShane Mon Oct 03, 2022 8:57 pm

    Those tubes were definitely not made by RCA - from the tube number markings on the tube glass in the first (top) picture they were Sylvania made.

    Bob Latino and mijohn like this post


    Sponsored content


    Strange set of RCA EL34s.   Any idea about the design? Empty Re: Strange set of RCA EL34s. Any idea about the design?

    Post by Sponsored content


      Current date/time is Sat Nov 26, 2022 9:23 am