[Amps] YC-156 vs 8877

[Jim Thomson]

Date: Sat, 27 Mar 2010 14:20:26 -0800
From: "Zeitler, Lane LT, FST-1" <zeitlel at cpr3.navy.mil>
Subject: Re: [Amps] Another source for YC-156's
To: "Jim Thomson" <Jim.thom at telus.net>, <amps at contesting.com>


Refresh my memory, that YC-156 is NOT an 8877, right?

Lane
Ku7i

## YC-156 is just a 3CPX-15,000B7... but with the smaller  4.94"  anode cooler. 

The original  3CPX 15,000B7  came with  a 8.32"  cooler. 

The tube is rated for 3.75A  CCS  @  6500 vdc. 

The integral grid flange is  5.25"  diam.  NO suppressor required.  No socket
required. 25 ohm input Z. Anything from 3000-7700 vdc  no load, works  fine on a YC-156
Like Larry sez... u only need 40 w  to get 1500w out. 150w = 7.5 kw.  200w = 10 kw
[dummy load of course] 
On a 3CX-3000A7,or a YU-148, you only require 50 w.. to get 1500w out. 
On a 3CX-3000A7, imd3 is -57 db pep @  5 kw pep out. It's even better
at  1.5 kw pep out. All these big tubes have superb IMD. Even if the emission is
1/2 gone, who cares. 

##  18 x months  ago, I designed a 2 x YC-156 amp  for a fellow in W6 land. It was
a  flame thrower.   A Rotron  CX-33  blower  will cool  2 x YC-156's.  Although the
infamous CX-33  blower is no longer made, it's being rebuilt  by 
 http://www.goodrichenterprises.com/page_oneweb5-02_004.htm
home page http://www.goodrichenterprises.com/page_oneweb5-02_001.htm

##  I tried  my CX-33 blower with a 0-240 vac   5A  variac... and it works really good. 
You can slow the blower way down, to a crawl, if u want =  less  noise.  It's a nice blower
and has loads of pressure. It  will  also handle air flow  vanes, if required.  There is a rubber
knock out, on either side of the outlet.    My CX-33  blower is a 230 vac unit.  A buddy across
town collects surplus AM + FM  broadcast TX.   The FM one had a single  GG- 3X15K in it.. and came 
with a pair of CX-33's.    I got mine for $50.00    For  1.5  to 2.0 kw ssb /cw use... just abt any blower
will  work fine. 

later... Jim  VE7RF