[Boatanchors] DX-100 RF delay

[Jim Wiley]

Does the DX-100 have grid block keying?  I forget - it has been 30 years 
since I owned one. If it does, I would look there to see if there is a 
problem. Also, check the VFO - it may be slow in starting, perhaps due 
to a marginal oscillator tube, or the cutoff bias being too high or not 
falling quickly.   The low drive may be a clue.  Does the drive come on 
all at once, or slowly build up over a short period  (even as short a a 
second or two)?  If it ramps up, I would definitely suspect one or more 
weak tubes in the oscillator and / or driver stages.  Try changing the 
VFO + driver chain tubes again. Replacements are not always good, even 
if new. Could be something else entirely, but those are some places to 
start looking.


- Jim, KL7CC


On 2/4/2013 4:19 PM, Bob wrote:
> I recently purchased a DX-100 that is mostly stock except for the fact that someone has removed the coarse loading function and no I don't think it is a B model.I have it putting out about 140 watts after some cleaning and tube replacement. At this point the only thing that is a problem is that there is between a two and six second delay before it puts out any RF when the plate switch is thrown. I thought it might be the plate switch and I paralleled the switch with a good one but no luck.It also exhibits the same delay when switching from CW to phone. At times after the set has been off for a while and I turn it on again I will have to readjust the driver before it will produce RF,maybe this is related to the delay problem.. Does anyone have any thoughts on where the problem lies?
>
> Thanks in advance
> Bob W1GTH
> _