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

[rbethman]

Yep!  My mistake!

Based on memory.  What we would call a brain fart!

Oops!

Bob - N0DGN

On 11/5/2011 6:39 PM, Glen Zook wrote:
> Actually, the HT-33 uses a pair of 4XC300A tubes, not a single 4CX300A 
> tube.
> Glen, K9STH
>
> Website: http://k9sth.com
> ------------------------------------------------------------------------
> *From:* rbethman <rbethman at comcast.net>
> *To:* hallicrafters at mailman.qth.net
> *Sent:* Saturday, November 5, 2011 5:26 PM
> *Subject:* Re: [Hallicrafters] HT-33A PL-172A Tube substitute modification
>
> 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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+------------------------------------------------------------------+
|               AM Amateur Radio Operator    NØDGN                 |
+------------------------------------------------------------------+
|               http://home.comcast.net/~rbethman/                 |
+------------------------------------------------------------------+
| Bob Bethman                \\\|///     " The absence of a danger |
|                           \\ ~ ~ //      signal does *NOT* mean  |
| rbethman at comcast.net      (/ @ @ /)      that everything is OK " |
+----------------------o00o---°(_)°---o00o-------------------------+