[Henry] Filament Transformers

Thu, 11 Dec 2003 10:43:39 -0500

Hi Mike

I had a 2KD, as delivered there is no step-start and they power up with
quite a pronounced THUNK!

'Sounds' like yours has a step-start added - thats good!

You should look over the filter caps and bleeders carefully.  It is quite
common for the bleeders (equalizing resistors) to open and toast a filter
cap.  Actually, I'm not at all sure which is the chicken and which is the
egg.  But I found one resistor open and a cap was shot. Many of the other
resistors had drifted high.  I replaced all the caps (best price was from
Henry - 10 years ago). Also replaced all the bleeders with higher wattage,
don't recall what tho.

The problem with the cap replacement will be physical... the new caps are
smaller but their mounting screw centers were a slightly different
dimension.  It wasn't a big deal, just a bit of rework on the phenolic
mounting plate.

One other area where age takes it toll.  The HV wiring may harden and crack.
Henry runs the AC HV up front to the SSB/CW switch.  Mine was plagued with a
rather scarey intermittent SNAP!  I replaced all the HV wiring to cure.

Be careful in there!

73, Bill
----- Original Message ----- 
From: "Michael Melland, W9WIS" <[email protected]>
To: <[email protected]>
Sent: Thursday, December 11, 2003 9:26 AM
Subject: Re: [Henry] Filament Transformers

> Hi Gene,
>
> Can't answer your question but I also wonder....
>
> My "new to me" 2KD Classic (1985 production) works great.  I notice a
> significant lag between when the amp is powered on and the blower starts
and
> filiaments glow.... everything seems to come up to speed after this brief
> lag slowly to full speed.  Mine also has the seperate filiament
> transformwer. I don't think Henry had a step start stock on these amps.  I
> suspect someone may have added one to mine although I admit I haven't
looked
> too hard for any mods ... none are obvious.  Perhaps this is just the way
> these amps start.... don't know ... never owned one before.  I had smaller
> amps like the 3 ea 811A Ten-Tec Centaur and it started at full speed
> immediately on turn on.
>
> Mike, W9WIS
>
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