[Hallicrafters] HT-33A PL-172A Tube substitute modification

[rbethman]

Take a look at the HT-33MKI.

It does NOT use the PL-172.  It DOES use a single 4CX300A.

Hallicrafters made the ht-33A and the HT-33B, both used the PL-172

Download the HT-33MKI PDF and you can look it over.  *IF* you can't find 
it, let me know and I'll send it direct.  The PDF is a tad shy of 3MB.

Bob - N0DGN

On 11/5/2011 5:56 PM, jack m wrote:
> Hello group,
>
> For 5 years, I have patiently searched for a useable PL-172A tube for my HT-33A amp.  3 EBay used PL-172A "wins" have been - well, you guessed right.
>
> The PL-172 market is getting worse!  In favor of a winter boat-anchor project this year, I've decided to give up looking.
>
> As much as I would like to keep this near-mint amp original, the desire to actually use it with my HT-32A has won out.  I was discussing this on the air this past week, and the ham on the other end recalled another ham who had converted his HT-33A rig to run one of the ceramic tubes, but he was not a boat anchor afficianado and did not have any details.  He did recall that ham as stating that the socket and chimney/air cooling system, as well as the various voltage supplies, were not all that difficult or complicated to modify and adapt to the HT-33A chassis or design power supplies.
>
> Is there anyone out there who knows of this mod, and where could I find the details?  As a "purist", I would prefer to be able to de-modify it in case the PL-172 market improves sometime in the future.
>
> Thanks
>
> Jack W3RU  		 	   		
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