SB-200 tubes.

[Chuck W4MIL]

Hi Ken,

I recently refurbished my SB-200................It's like new now and 
will last for another 40+ years (longer than I will).

Some suggestions:   For tubes, contact Frank, K5SVC.  E-mail address 
is:  K5SVC at Natchez.net

I've purchased tubes from him for my Collins and most recently a pair 
of 572B's for the SB-200.  He has been very reliable and I would try 
him before anyone else.  BTW, replace your 572B's with, .............. 
572B's.

If your SB-200 is original and has no mods.............consider 
upgrading the rig with a new power supply board and a soft-start relay 
module from Harbach Electronics.  Contact Jeff, W8CQ, at:    
info at harbachelectronics.com    Again, a reliable source with excellent 
parts.  Your SB-200 will emerge better than new.

And one other thought.  If you subscribe to Electric Radio, check out 
the article in the April 2007 issue (#215) on aligning the input coils. 
  Many of us have already done this, but WD8DWR took the time to write 
it down for all to benefit from and Ray published it for all to see.

Those of us who own SB-200's already know it's a great amplifier and 
that it can be improved with little effort.  The Harbach mods are 
excellent.

I don't have financial interests in the above mentioned 
parties.............but I've done business with them and they are tops 
in my book.  I'm just an OT ham who loves boatanchors.

Hope this helps.

73 de W4MIL
Chuck


-----Original Message-----
From: Kenneth G. Gordon <kgordon2006 at VERIZON.NET>
To: HEATH at LISTSERV.TEMPE.GOV
Sent: Mon, 4 Jun 2007 3:14 pm
Subject: [HEATH-TEMPE] SB-200 tubes.










Which tubes would you recommend to replace the two  572Bs in
my SB-200?

AES has them at $169.00 each, but a pair of those would cost
more than the amp.

I haven't been able to find out whether or not Cetron is still in
business.

The Svetlana versions appear to have rather small plates and
higher mu, so may not work correctly in the SB-200

The Chinese tubes are certainly inexpensive, but I have not been
able to find out anything about their reliability, etc.

Suggestions?

Ken Gordon W7EKB

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