[AMRadio] 4H4 Ballast


Bob Maser bmaser at tampabay.rr.com
Mon Feb 20 10:46:18 EST 2006


Thanks to all for the 6V6 substitution info.  In the back of my brain I kind 
of remembered that.  I also found a pair of 6C4's on eBay and the price was 
good.

Bob W6TR
----- Original Message ----- 
From: "Edward B Richards" <zuu6k at juno.com>
To: <amradio at mailman.qth.net>
Sent: Monday, February 20, 2006 1:36 AM
Subject: Re: [AMRadio] 4H4 Ballast


> Hi Bob;
>
> Use a 6V6 in place of the 4H4 ballast tube. I have a used but good 6V6GT
> and a NOS 6C4 you can have for $5 plus $2 shipping. Good luck.
>
> 73, Ed Richards K6UUZ
> Simi Valley, Ca 93065
> Home of the Air Force 1 pavilion
>
> On Sun, 19 Feb 2006 22:52:04 -0500 "Bob Maser" <bmaser at tampabay.rr.com>
> writes:
>> It appears that I have found the problem in my HRO60.  I turned it on
>> one
>> day last week and all I could hear was floor noise.  I couldn't even
>> hear
>> the xtal calibrator and all drawers(bands) were the same.  After
>> much poking
>> and prodding and tube testing, come to find out the 4H4 has a broken
>>
>> filament wire, which means that the HF oscillator and the mixer
>> aren't
>> getting any filament volts.  Now I need a replacement 4H4.  Anyone
>> have a
>> spare they would be willing to part with?  I have a 7H4B but when I
>> plugged
>> it in I get 12VAC out to the mixer and HF osc filaments.  My HF
>> Oscillator
>> tube 6C4 is really weak so I need one of them too.
>>
>> Help would be appreciated.
>>
>> Bob  W6TR  Florida
>>
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