[Amps] Grid Holes; 572Bs

[Pat Barthelow]

Folks

Reading a lot of similar probs on the FL 2100, It would be interesting for 
anyone who has excessive Plate current to pull the tube and carefully look 
up inside the plate, from the bottom or top end of the tube, and see if any 
grid wires are melted, allowing Ip.  I betcha most with Ip on standby have 
this problem.  Causes, or cures, I dont yet have an opinion.

73, Pat aa6eg at hotmail.com




>From: "Osten B Magnusson" <sm5dqc at algonet.se>
>To: <amps at contesting.com>
>Subject: [Amps] Addition to FL2100z problem
>Date: Tue, 8 Apr 2003 16:06:11 +0200
>
>
>
>Hello again!
>
>I changed the tubes between sockets, first it was the tube
>at left that became ''red'', when changed it's the same one
>now in the other socket. So it's obvious I have a bad tube,
>it's Taylor 572B's from 1994 production.
>
>I think I have a pair of Cetron tubes, but don't want to put
>them in until I get to know the reason for the following:
>
>In addition to the bad tube, there seems to be a bias problem,
>why does the FL2100z shows 50 mA Ip in ''stand by''?? That
>it's only 60 mA in ''operate''  - no drive -  can probably be
>adjusted.
>
>The first notice of the problem was that my TenTec Corsair II
>''shut down''  - the power supply security function -  at times,
>never happened without the amp.
>
>Maybe this is to ''simple'' for this reflector, but I'm a old DX'er,
>I have not built or worked with amps for many years...  I have
>an amp project  - KW for 160 and 80 with one tube -  but DX
>takes too much time!!
>
>73 de Osten SM5DQC    sm5dqc at algonet.se
>
>
>
>
>
>
>
>
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