[Milsurplus] TCS 9

[w8au at sssnet.com]

At 12:20 AM 7/25/05, k4elv at bellsouth.net wrote:
>I've been working on this TCS 9 for the past two weeks and have a 
>problem  I have 490V B+ and 215V on the screens (under load).  when I try 
>to key on CW the K102 relay switching the B+ arcs like a neon sign when 
>the key is released.  The only way I can stop the arcing is to switch the 
>B+ off manually.  I've checked the circuit and can't find anything 
>wrong.  I've worked on the relay and adjusted it out of the circuit using 
>a VOM to check continuity.  It releases FB and the spacing seems right.  I 
>went so far as to try another relay and had the same results.  Also tried 
>an outboard tuner but no difference.  I've cleaned all the tube sockets 
>and made certain that all grounds are tight and secure.  Any ideas?

What is your voltage in idle state? (key up)   Seems like it may
be quite high?  If it is, you need better regulation.

If not, you could try a reverse diode snuffer across those contacts.

Perry   w8au