[Amps] Vacuum relays in Dentron MLA-2500

[R.Measures]

>In a message dated 12/26/2003 11:53:08 AM Eastern Standard Time, 
>n4dek at triad.rr.com writes:
>
>> Wondering if maybe someone that has access to the schematic for the 
MLA-2500 
>could take a look at it and let me know what I would need to change this 
>amp to use vacuum relays. I've been told that I would need two relays but 
>really don't know for sure. I've found several vacuum relays on ebay but 
>need to be sure of what I need to get. One or two? Voltage? ect.   I can't 
>deal with the relay noise in this amp any longer. 
>> Please help!
>
>You need two if you are using SPDT vacuum relays, one to switch the 
>incoming RF from the transceiver to the input of the tubes 

**  This job can be performed by a Matsushita "RSD" RF reed relay.  Bias 
T/R switching can be done by an optoisolator and a NPN switch transistor. 
 

>and one to 
>switch the output from the amp to the antenna.  The MLA-2500 uses an open 
>frame DPDT relay to accomplish both of these functions.
>
>73........de Goose, W8AV
>_______________________________________________
>Amps mailing list
>Amps at contesting.com
>http://lists.contesting.com/mailman/listinfo/amps
>