Thanks for all the input on the Titan amp.
As soon as I can get at it I will pop the covers off the RF deck and PSU
and check the micro-switches and fuses that you pointed me to.
I will post any findings when I solve the problem
73
Ken VA3KA
On Tue, Oct 25, 2016 at 4:02 PM, Jim Brown <jim@audiosystemsgroup.com>
wrote:
> That's right, Joe -- the Molex connector must be fully inserted and
> inserted correctly. Like most Molex, I don't think it's possible to insert
> it wrong.
>
> I just looked at the schematic to refresh my memory. That multi-conductor
> cable carries the power interlock, filaments, the 28V DC supply, and 120VAC
> to run the fan. Check my schematic. The interlock goes through a
> micro-switch under the cover of the PSU and another under the rear cover of
> the RF deck.
>
> See my notes on the schematic about failures that can fry traces in the
> 28VDC section of the power supply. Also, there's a 4A slow blow in the
> surge protect circuit. It's inside the PSU. And there's a 1 ohm resistor in
> series with the 28VDC line that serves as a fuse for the 28V bus.
>
> I have three vintages of 425s here. All have the main power switch on the
> RF deck (it's the bottom switch).
>
> My schematic does NOT include details of the RF circuitry around the tubes
> (LPF at input, and the tank circuit), and there are variations from one
> vintage to another.
>
> http://k9yc.com/Titan.pdf
>
> 73, Jim K9YC
>
> On Tue,10/25/2016 11:49 AM, Joe Giacobello, K2XX wrote:
>
>> I've sold my Titans, but besides the HV cable you need the low voltage
>> cable between the P/S and RF deck. IIRC, the power switching is done
>> through that cable. (Make sure the green dot faces up when you plug the
>> cable into the Molex socket.) Also, IIRC, there is a power switch on the
>> P/S together with voltage selector and fan speed switches. Some of the
>> earlier units may not have had the voltage selector or fan speed switches.
>>
>
>
>
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