[Hallicrafters] HT-32 to HT-37

[Alf Fisher]

I have had a 6X5 go short and heard of other guys that have had the same 
problem.
Fortunately in my case, the fault caused the mains fuse to blow and it 
protected the mains transformer from meltdown.

I think fuses are definitely a good idea and a suitably rated one in the 
feed to the transformer primary will prevent the transformer being cooked in 
the event of a rectifier flashover.

73,
Alf
G3WSD


----- Original Message ----- 
From: "Richard Knoppow" <1oldlens1 at ix.netcom.com>
To: "Wilson Lamb" <infomet at embarqmail.com>; <hallicrafters at mailman.qth.net>
Sent: Tuesday, October 02, 2012 5:49 PM
Subject: Re: [Hallicrafters] HT-32 to HT-37


>
> ----- Original Message ----- 
> From: "Wilson Lamb" <infomet at embarqmail.com>
> To: <hallicrafters at mailman.qth.net>
> Sent: Tuesday, October 02, 2012 9:27 AM
> Subject: [Hallicrafters] HT-32 to HT-37
>
>
>>
>> Put in the SS diodes, with some resistors or a choke to
>> set the voltage.
>> Use the 5V winding to buck down the primary.
>> I think I saw a bad 5V4 or 6X5 yrs ago, but I've never
>> seen a 5U4 or 5R4 short.
>> They have quite a bit of space between fil and plate and
>> I've used the 5R4 up to 800V.
>> And how about a fuse in the secondary?
>> Wilson
>> W4BOH
>
>    I've seen 6X4's with heater to cathode shorts a couple
> of times. One fried a transformer.  The 6X4 is a miniature
> version of the 6X5 so the element spacing may be closer, I
> don't know. I have not had a problem with the 6X5 octal
> version.
>
>
> --
> Richard Knoppow
> Los Angeles
> WB6KBL
> dickburk at ix.netcom.com
>
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