re: dentron gla 1000 mods.
>
> The Svetlana EL-509 is a candidate for the Dentron, there is
> an article on their web site and a technical bulletin.
>
:Has anyone on this list done this conversion? If so, please tell.
>
Yes, but not using the Svetlana web page information. It's similar.
>
:What about the EL-519 valve. A local dealer says it is a higher rated
:equivalent. Is it? Will it fit?
>
The 509 is the best choice.
>
> What the Svetlana conversion project fails to do is complete the job...
> The cathode current should be cut off in standby by a simple mod using
> the original relay.
>
:More?
:73 de Leon ZS4Y
>
Simple enough. The cathode lead of the amplifier is brought over to the
un-used center TPDT contacts of the T/R relay. A 50K 5 watt resistor is
paralleled with the cathode leads soldered on relay connections. Use the
Normally open contact and the wiper.
This lead is between the cathode and the bias zener diode.
>
The idea is to short out the 50K resistor in the transmit position with
the added relay contacts. In standby/receive mode, the 50K resistor
greatly reduces the current draw.
>
Aside from the resistor, there's almost no additional cost to add this
modification which extends tube life.
cheers
skipp
nospam4me@juno.com
>
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