[ARC5] Why "Noodling" About Sweep Tubes

[Geoff]

Sounds like hack by chainsaw methods; you ever see a BC-375?

Carl


----- Original Message ----- 
From: "Fuqua, Bill L" <wlfuqu00 at uky.edu>
To: "Dennis Monticelli" <dennis.monticelli at gmail.com>; "Robert Eleazer" 
<releazer at earthlink.net>
Cc: "ARC-5 Maillist" <arc5 at mailman.qth.net>
Sent: Tuesday, October 22, 2013 2:24 PM
Subject: Re: [ARC5] Why "Noodling" About Sweep Tubes


>  One other thing, when using these tubes you are allowed to let the plate 
> glow.
> Looks great in an amplifier.
>   If you use a 4-125A you can later on upgrade to 4-240A, 4-400A or 3-500z 
> (if G-G amp) by
> using larger filament transformer and higher current power supply, you may 
> have to change
> the input and output ckts depending on design. If you use continuously 
> variable designs using
> roller inductors and they are conservatively rated no change needed . 
> Sockets are all the same.
>
> 73
> Bill wa4lav
>
> ________________________________________
> From: arc5-bounces at mailman.qth.net [arc5-bounces at mailman.qth.net] on 
> behalf of Fuqua, Bill L [wlfuqu00 at uky.edu]
> Sent: Tuesday, October 22, 2013 2:19 PM
> To: Dennis Monticelli; Robert Eleazer
> Cc: ARC-5 Maillist
> Subject: Re: [ARC5] Why "Noodling" About Sweep Tubes
>
>  Common tubes that are rather inexpensive are 4-125A and 4E27A tubes.
> Lots were manufactured and floating around out there but very very few 
> applications.
>  If you look on ebay at the "Sold Prices" for these tube not the listed 
> prices you will see that
> they sell from $7 to an extreme of $20, but mostly around $10 or $12 each.
>  These are great tube to build amplifiers from, much better than 813's 
> which are more popular.
> The 4E27A will fit in a 813 socket. So, why use a sweep tube when you can 
> get good
> cheap transmuting tubes.
>
> 73
> Bill wa4lav
>
> ________________________________________
> From: arc5-bounces at mailman.qth.net [arc5-bounces at mailman.qth.net] on 
> behalf of Dennis Monticelli [dennis.monticelli at gmail.com]
> Sent: Tuesday, October 22, 2013 12:53 PM
> To: Robert Eleazer
> Cc: ARC-5 Maillist
> Subject: Re: [ARC5] Why "Noodling" About Sweep Tubes
>
> You may wish to consider connecting a beam power tube as a triode and
> trying it in the application.  As noted previously the 6DQ6 is a
> lightweight; indeed all sweep tubes are deficient in plate dissipation.
> They have a lot of cathode and can handle the peaks, but not the high
> average.  The 6146B variants are better of course.
>
> You should be able to find useful curves for triode-connected beam power
> tubes among the audiophile documentation.
>
> Dennis AE6C
>
>
> On Tue, Oct 22, 2013 at 7:04 AM, Robert Eleazer 
> <releazer at earthlink.net>wrote:
>
>> Dave:
>>
>> I have a 12DQ6B, acquired for reasons that currently escape me.  Looks
>> like it is NOS NIB.  Maybe I bought it in a lot of tubes, not sure.  I am
>> pretty sure the 6DQ6B is a widely used sweep tube.  You are welcome to 
>> the
>> 12DQ6B if you wish.
>>
>> I also have a couple of 6GE5's.  I believe these are sweep tubes and I
>> know I acquired these for use in some future project; I think either a
>> crystal controlled Galaxy transceiver or an HW-18.  I recall they were
>> pretty cheap.
>>
>> Also, I recently bought a sleeve of five 6883B's.  They are 12 Volt
>> 6146B's.  I plan to use them in a TS-520 I am repairing and also possibly
>> in a HW-100.  They appear to be NOS NIB and cost me a total of $20 plus
>> shipping, a total of less than $30.  Don't know if they are adaptable for
>> the BC-375 but they are available on ebay, occasionally for astonishingly
>> low prices.  The 6159, the 24 volt 6146, is available also; I got a pair
>> for $10.
>>
>> Wayne
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