[Yaesu] FL-2100B Question.

[KB0NLY]

That’s a good point, the last one I rebuilt was a bit high as well.  If it 
still has an original pair of tubes you really want to make sure you check 
everything.  The Cetron's were shot in my amp when I got it, I put in a 
cheap set of Taylor's from RF Parts, haven't had an issue with them.  RF 
Parts is working on getting some redesigned 572B's that match the Cetron's 
internal structure, they were supposed to have them this spring but last I 
checked still not available.

When these Taylor's die I will likely convert over to something else.  My 6m 
amp built off a 2100B chassis uses a GI7BT and it has been extremely 
reliable and produces less heat then a pair of 572B's.

73,

Scott KB0NLY



-----Original Message----- 
From: Dennis
Sent: Thursday, July 10, 2014 11:06 AM
To: yaesu at mailman.qth.net
Subject: Re: [Yaesu] FL-2100B Question.

Since you're starting out with a restored unit I'd check the filament 
voltage on those tubes. Use a good AC volt meter. Pay attention to the 
transformer taps and make sure they're correct.  Use clip leads directly to 
the socket WITH TUBES INSTALLED.  Even using the right taps on the 
transformer those often had excessive filament voltage causing you to go 
through tubes at the speed of light.  I had to put a resistor in mine when I 
had it years ago.  I simply wound a small length (around a foot or 18" if I 
remember right) of #18 solid copper wire around a 1/2" ceramic form to get 
it down. Don't take my wire measurements for granted, do your own 
calculations depending on what you discover.  You might be lucky and not 
have to make any changes, but it's worth the effort to check.  Prior to that 
I went through two sets of tubes in 18 months.  I'd set it to a voltage a 
few tenths below the spec, they'll run for years that way and you won't have 
any emission loss.
Dennis
N0SP

--- gharmon at idworld.net wrote:

From: "Gary H. Harmon, Jr." <gharmon at idworld.net>
To: "YAESU " <yaesu at mailman.qth.net>
Subject: [Yaesu] FL-2100B Question.
Date: Thu, 10 Jul 2014 10:21:19 -0500

Restoration is almost complete on a FL-2100B amplifier.  Massive cleanup,
installation of a three wire cord and repainting the cabinet from black to
grey and the trim ring to its correct color.  Fans also needed cleaning and
a relube plus some screw replacement to make it all look nice.



In the SWR circuit are two variable resistors, VR1 and VR2 but I don't see
any alignment instructions in the manual.  Does anyone have the process?



73,



Gary H. Harmon, Jr. - K5JWK - HAM Radio Archaeologist

6003 Archwood

San Antonio, TX 78239-1504

210.657.1549h / 210.884.6926c/t



"Retirement = Every day is a Saturday except Sunday"

http://www.grissomroadcoc.org





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