Reid Brandon at Eimac phoned me today. Reid passed this important
info along.
The correct phone number for Arnold Howell [KB8JCY] of Howell Tube
Sales is 330-744-7582. Make sure to *82 1st... to shut OFF your
call block [if u have auto block]. Arnold returns calls fairly
promptly. Also, Arnold Howell's CORRECT e-mail
address is ... KB8JCY @ AOL.com His snail mail address is PO
Box 5842, Youngstown, OHIO, Zip- 44504 He has NO website.
Also had Arnold Howell himself, phone me this afternoon. Howell had
Eimac build a... "hot rod" version of a 3CX-1200.... called a YU-
120. This is the 1500w anode dissipation version... with a 6.3 V
@ 26 A filament. There is also another version... called a 3CX-
1500D7. The 1500D7 version is the same 1500 w anode
dissipation.... EXCEPT the fil is 5.0 V @ 30 A. BOTH versions of
these tubes are thoriated tungsten fils, instant on, and both use a
SK-410 [or any version of a 3-500Z socket, like the Johnston] socket.
He also has the custom Teflon chimney's for them.
Howell also tells me, he has 20-24 x YC-179's available... $400.00
plus shipping. He also has access to hypersil pole pigs... most
in 4160+ 4800 V taps.... and also 7200 V...... all in 5-10-15-25
Kva... with, OR without the oil. He also has some 4CX-10,000D's,
and 4CX-5000A's available. Also available, are blowers for 3CX-
10,000A7's, etc.
The story on the YC-243 [socketless version of the 3CX-6000A7 /YU-
148] is... he needs a minimum order of 10 [TEN] to justify a small
production run by Eimac. Apparently,[no surprise], costs go down,
with volume... and tubes are bought in either quantities 1-4.... 5-
9.... 10-49..... 50-XXX.
The YC-243 is ONLY available from Howell.. not anyone else.. like
Richardson. The "YC" designator means it's a custom made tube for
a client. The YC-243 rebuild process is done by Freeland.[Way
better price than Econco... both are 2 x biggest tube rebuilder's
about].... so it can be rebuilt over and over again.
The tube has identical electrical specs to a 3CX-6000A7. Reid Brandon
e-mailed me the official Eimac PDF document on the YC-243. This
version contains ALL the 'typ' operating parameter's for AB2
operation... like Cathode Driven AM operation.... Cathode Driven AB-
2 SSB..... And Class C, Cathode driven CW operation. [The
Eimac 3CX-6000A7 literature is for AB-2 FM broadcast..... the
Svetlana specs also include Class C FM broadcast, with loads of bias]
The biggest feature of the YC-243, is the expensive socket [now
$375.00 from RF parts] is NOT required.... being a socketless tube.
Per the Eimac spec's... the input Z is 50 ohms. I found some minor
discrepancies and typo's between the YC-243 spec sheet + the 6000A7
sheet... and these will be corrected.
Told Reid about the increase in anode diss, that's possible with a
lower intake air temp... AND increased airflow.... AND described the
9.5" square box built around the tube.... with a solid teflon top.
He agreed any TAPERED cone shaped chimney, should be at LEAST 8"
diam... and pref even bigger. Both Howell and Economy Electronics
make straight up/down chimney's for this tube.[6.3" ID]... but Reid
agreed... both those versions restrict the airflow way too much.
I'm going to forward him my finding's.. and measurements, of what
our 'typ' operation is.
So the short of it...a min of 10 x tubes [in total], needs to be
ordered by Howell...from Eimac. Contact Howell, if you are
interested.
Later.... Jim VE7RF
