Re: [AMRadio] Loudenboomer MK2 hv supply tubes

[D. Chester]

If the power supply is designed to use 866A's, don't worry about using 
3B28's; they will work just as well.  They are exact replacements, and tend 
to give less trouble than the MV tubes, even though they don't have the 
pretty blue glow.


If you look closely in dim light, you can see a violet glow deep inside the 
plate structure.


Likewise, the 4B32 is a direct replacement for the 872A.  The 3B28 and 4B32 
use xenon gas instead of mercury as the ionising medium.


Of course, solid state replacements will also give identical performance. 
Mercury, xenon and solid state rectifiers all have a fixed voltage drop that 
is insignificant in HV applications.  High vacuum tubes have a substantial 
voltage drop at normal operating current.  There is a high-vacuum version of 
the 866A, the 836.  I'm not sure if it has as high a p.i.v. rating as the 
866A, or if it is more like the old 866 that had only 7.5 kv piv instead of 
the 10kv rating of 866A's and 872A's, 3B28's and 4B32's.


I have found the best on-line source for tube info in Frank's Electron Tube 
Data sheets at http://tubes.mkdw.net/index.html.  For some reason, the USA 
link is dead, but any of the other links will work, and they all have 
identical data.  I usually click on the Australian one.  You can find data 
on obscure tubes such as subminiatures, European types and special military 
types.  On most tube types there are multiple data sheets of data published 
by different manufacturers, which sometimes gives you more information than 
books like the RCA, GE or Eimac manuals.


Don k4kyv 


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RE: [AMRadio] Loudenboomer MK2 hv supply tubes

[Phil LaMarche]

Thanks Van.  Now I'm going to get solid state replacements.  My manual is at
a hams house who is gone for 2 weeks and I couldn't remember if it was that
or the 3B28.  Many thanks for the response. 


Philip LaMarche 
LaMarche Enterprises, Inc.
www.instantgourmetspices.com 
www.w9dvm.com 
800-395-7795 pin 02 
727-944-3226 
FAX 727-937-8834 
NASFT 30210 
W9DVM 
  


-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Van K7VS
Sent: Friday, March 28, 2008 4:11 PM
To: Discussion of AM Radio in the Amateur Service
Subject: Re: [AMRadio] Loudenboomer MK2 hv supply tubes

My Mark IIA Manual says put in a pair of 866A's.
Van, K7VS
- Original Message -
From: "Phil LaMarche" <[EMAIL PROTECTED]>
To: "'Discussion of AM Radio in the Amateur Service'" 

Sent: Friday, March 28, 2008 11:16 AM
Subject: [AMRadio] Loudenboomer MK2


>
> Can anyone tell me the rectifier used in the HV of the Power Supply.
>
> Thanks
>
> Phil
>
> Philip LaMarche
> LaMarche Enterprises, Inc.
> www.instantgourmetspices.com <http://www.instantgourmetspices.com/>
> www.w9dvm.com <http://www.w9dvm.com/>
> 800-395-7795 pin 02
> 727-944-3226
> FAX 727-937-8834
> NASFT 30210
> W9DVM
>
>
>
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> 10:58 AM
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Re: [AMRadio] Loudenboomer MK2 hv supply tubes

[Van K7VS]

My Mark IIA Manual says put in a pair of 866A's.
Van, K7VS
- Original Message - 
From: "Phil LaMarche" <[EMAIL PROTECTED]>
To: "'Discussion of AM Radio in the Amateur Service'" 


Sent: Friday, March 28, 2008 11:16 AM
Subject: [AMRadio] Loudenboomer MK2




Can anyone tell me the rectifier used in the HV of the Power Supply.

Thanks

Phil

Philip LaMarche
LaMarche Enterprises, Inc.
www.instantgourmetspices.com 
www.w9dvm.com 
800-395-7795 pin 02
727-944-3226
FAX 727-937-8834
NASFT 30210
W9DVM



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No virus found in this incoming message.
Checked by AVG.
Version: 7.5.519 / Virus Database: 269.22.1/1348 - Release Date: 3/28/2008 
10:58 AM






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