[Boatanchors] E.F Johnson calibrator 250-28 tube?

[Bruce Ussery]

Oops- I can see how my post may have caused confusion. 6BH6 is the clear 
winner (thanks for checking guys).  6AU6 had been mentioned as a possibilty. 
My very brief research showed it to be a somewhat similar tube and I just 
tried it out of curiosity.

On a totally unrelated note- A previous owner also replaced the main tuning 
and bandspread knobs on this HQ-140-XA with BC-348 knobs. I won't bother 
trying to find originals. They work great. Most of the black krinkle paint 
was gone, so I decided to try to improve them. As much as I cringe at trying 
to paint anything, I remembered seeing "wrinkle finish" black paint 
somewhere. I found it at Auto Zone I think; Krylon 3370 Black Wrinkle. After 
removing the remaining paint with a little wire brush Dremel tool, I 
followed the instructions and it actually worked! The knobs are nice shiny 
black krinkle again. So if you want to spruce up those BC-348s as a winter 
project, have at it..

----- Original Message ----- 
From: <telegrapher at att.net>
To: "William Shadid" <wa9mxq at earthlink.net>
Cc: <boatanchors at mailman.qth.net>
Sent: Tuesday, December 11, 2007 8:08 PM
Subject: Re: [Boatanchors] E.F Johnson calibrator 250-28 tube?


> Well what a fine show this is.  Now, which tube is correct?  The 6BH6 or 
> the 6AU6.  Or maybe different versions or some were modified?  Who dreams 
> up this stuff anyway?  It's to close to Christmas.
>
> I don't have one of these but i've run into the same thing with a couple 
> of my radios. One manual says one tube lineup and another manual says 
> another tube lineup.  What fun, yes?
>
> Larry
> W0OGH
>
>
> William Shadid wrote:
>
>>
>> I have a 1962 E. F. Johnson catalog and on page 22 it clearly shows and 
>> describes thje 250-28 Calibrator. It also calls out the original tube as 
>> the 6BH6 that the rest of you have mentioned. Only $18.95 in 1962 
>> dollars!!
>>
>> 73,
>>
>> -Bill, WA9MXQ
>>
>>
>>> ----- Original Message ----- From: "jeremy-ca" <km1h at jeremy.mv.com>
>>> To: "Bruce Ussery" <twc9198764412 at earthlink.net>;
>>> <boatanchors at mailman.qth.net>
>>> Sent: Monday, December 10, 2007 10:08 PM
>>> Subject: Re: [Boatanchors] E.F Johnson calibrator 250-28 tube?
>>>
>>>
>>>> Mine has a 6BH6 and is also in a HQ-140X. I also like the Hammarlund
>>>> tuning and the great bandspread.
>>>>
>>>> Carl
>>>> KM1H
>>>>
>>>>
>>>> ----- Original Message ----- From: "Bruce Ussery" 
>>>> <twc9198764412 at earthlink.net>
>>>> To: <boatanchors at mailman.qth.net>
>>>> Sent: Saturday, November 10, 2007 8:37 PM
>>>> Subject: [Boatanchors] E.F Johnson calibrator 250-28 tube?
>>>>
>>>>
>>>> I recently brought an HQ-140-XA back to life. The more I play with it 
>>>> the
>>>> more I like it's smooth, accurate tuning and good audio. A previous 
>>>> owner
>>>> added a 100 kc crystal calibrator (and did a neat job), but it's not 
>>>> the
>>>> XC-100 model that is mentioned in the manual. It's an E. F. Johnson 
>>>> 250-28
>>>> which looks pretty similar. It's working OK, but the tube number is
>>>> scraped off. If it croaks (probably not in my lifetime), I don't know 
>>>> what
>>>> to replace it with. My usual searches revealed to details of this unit,
>>>> only that it exists is other hams shacks. So-- does anyone have one or
>>>> know what the tube is? I promise to add a nice label for the next 
>>>> owner.
>>>>
>>>> Bruce
>>>> WA4ZLK
>>>> _______________________________________________
>>>>
>>>
>>>
>>>
>>> End of Boatanchors Digest, Vol 47, Issue 14
>>> *******************************************
>>>
>>
>> _______________________________________________
>>
> _______________________________________________