[CW] Fwd: Art:: Name This Tube = It's a WE Type 241A (or "B") == Yeah

[D.J.J. Ring, Jr.]

Date: Sun, Mar 15, 2020 at 7:47 PM
Subject: Art:: Name This Tube = It's a WE Type 241A (or "B") == Yeah
To: Art Lebermann

Sunday PM, March 15, 2020
Hello Art,
Wow... thank you... It's been 2 days and I could find nothing on this
tube... no markings.. Yes... WE 241A makes sense... As always, Lud comes to
the rescue... He correctly identified the Bell Labs 175 transatlantic cable
tube 10+ years ago... the markings on the tube only contained info on the
testing results..
Thanks again.
Dave

-------- Original Message --------
Subject: Fw: Name This Tube? It's a WE type 241A (or "B")


Dave...
Mystery solved.  I forwarded your email to Ludwell Sibley – probably the
most knowledgeable person on the planet, when it comes to rare tubes.
Forward to those that might be curious!
ART


*From:* Ludwell Sibley
*Sent:* Sunday, March 15, 2020 11:29 AM
*To:* 'Art Lebermann'
*Subject:* RE: Art: Name This Tube?

I’ll bet it’s a 241A (or 241B), originated by Western Electric.  Here’s my
claim:

*241( )*     Power triode, 212D w/ large (0.8125") cap, on special
three-pin metal-shell base (3/8" pins), for HF use.  Plate sup­ported from
top of bulb.  Four in paral­lel as buf­fers in Lawrenceville xmtrs.  "B" is
212E w/ same cap and base, uprated to 7.5 MHz {32Y} (AX, ML also).

The single-ended  212-type that originated it was used in audio (theater)
amps and AM broadcast transmitters.  Yours has the top cap to get
capacitance down for short-wave use.

Lawrenceville NJ was the transmitter site for intercontinental and
ship-to-shore telephone use (the receivers were at Netcong). I don’t know
where the California equivalent station was for transpacific service, but
the receivers were at Point Arena.

“32Y” was the Bell Labs development number, of late-‘20s vintage.  The “Y”
just tells us it’s a triode.

Dunno why they invented a unique base..

Apparently enough of them were needed that Amperex made them too.  Machlett
Labs took over the whole WE transmitting product line ca. 1948.

I got out the 241B from the WE display cabinet.  Sure looks like yours!

Lud
------------------------------
*From:* Art Lebermann
*Sent:* Saturday, March 14, 2020 11:43 PM
*To:* Ludwell Sibley
*Subject:* Fw: Art: Name This Tube?

Hi, Lud...

Can you identify this tube, with a large 3-pin base?

Art Lebermann, W6REQ
CHRS / AWA


*From:* David Navone
*Sent:* Saturday, March 14, 2020 12:55 PM
*To:* Art Lebermann
*Cc:* dnavone at davidnavone.com
*Subject:* Art: Name This #355 Tube

Hi Art,
Bob Savage bought a lot of old tubes.. and this one is unmarked, save for
the #355 on the paper towel surrounding … The base is copper. Three
“Getters.”
Do you have any info?
Thanks.
Dave
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