[Hallicrafters] Linear - HT-45 MK 11 A

[Sandy, W5TVW]

Way back.....the 3-400 was derived from the 4-400 tube.  If you noticed, the base
diagram reveals the 3-400 has grid connections on all the "grid/screen" pins
the 4-400 has.  Therefore, all the 4-400 grids will be "grounded" if one is 
plugged in.  The 4-400 being an excellent "sub" for the 3-400 if there is
enough vertical room to accommodate the extra height.  I don't remember if
additional bias is required or not.

73,
Sandy W5TVW
----- Original Message ----- 
From: "CALVIN L. SHERMERHORN" <banjo at mb.sympatico.ca>
To: <hallicrafters at mailman.qth.net>
Sent: Sunday, June 30, 2002 4:23 PM
Subject: [Hallicrafters] Linear - HT-45 MK 11 A


| Hi there: I have the above linear with 4-400 tube installed. Since the
| manual is written concerning 3-400 can someone plse enlighten me as to
| the "idling current control circuit" which appears in para 3-5. Does
| this apply to the 3-400? The other reason for my question is that i am
| looking for a 12VDC Dow Key Antenna relay with the Aux Contacts which
| are hard to find. Are such aux contacts necessary with the 3-400.?
| Tnx in advance for any help. Vy 73 de Cal VE4XQ.
| 
| _______________________________________________
| List Administrator: Duane Fischer, W8DBF **for assistance**
| dfischer at usol.com
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