Re: Quick question Andy

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In Reply to: Quick question Andy posted by Russ57 on July 6, 2006 at 09:53:21:

I was given some tubes and I have six type 31 and ten type 30. Which one do you think would be the best choice for a preamp? Or do you think I would be better suited to try and sell and/or trade and get the type 26?>
Definitely keep the 30 and 31. You will probably have some microphonics problems - I found the 30 less trouble than the 31, though others have found the other way round. I slightly prefer the 30 for its airy treble but the 31 is a handy choice for its lower plate resistance if that is needed. The 26 is a fatter, warmer sound - many prefer it, others like the 30 and 31 which are thinner. Probably 30/31 = 2a3 and 26 = 300b tone wise.
You may get addicted once you have this up and running. I used a couple of bench DC supplies so I could try out all sorts of different tubes with the same base - you could do the same during your 'experimentation' phase, particularly if you have mates that can bring round DHTs. Just dial in the filament voltage. I used some CMCs on the end of the DC supply which smoothed the sound. Examples (different current ratings):
http://uk.farnell.com/jsp/endecaSearch/partDetail.jsp?SKU=3247120&N=401
http://uk.farnell.com/jsp/endecaSearch/partDetail.jsp?SKU=523859&N=401
http://uk.farnell.com/jsp/endecaSearch/partDetail.jsp?SKU=525510&N=401 (this is 1.3mA if you want to use 26)
http://uk.farnell.com/jsp/endecaSearch/partDetail.jsp?SKU=3247260&N=401 (this is 1.3mA if you want to use 26)
http://uk.farnell.com/jsp/endecaSearch/partDetail.jsp?SKU=525534&N=401 (this is 1.7mA if you want to use 46 or the other beefier ones)

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Follow Ups Full Thread

Topic - any new DHT tubes out there? - Carl Gigun 01:22:50 07/06/06 (7)

Re: any new DHT tubes out there? - andy evans 09:15:10 07/06/06 (3)

Quick question Andy - Russ57 09:53:21 07/06/06 (2)

Re: Quick question Andy - andy evans 11:16:57 07/06/06 (0)

Re: Quick question Andy - fatbottle 10:51:13 07/06/06 (0)

Re: any new DHT tubes out there? - Jimmy 06:59:36 07/06/06 (1)

Re: any new DHT tubes out there? - Jimmy 07:36:13 07/06/06 (0)

Re: any new DHT tubes out there? - mikeyb 06:26:41 07/06/06 (0)

Follow Ups

Re: Quick question Andy - andy evans 11:16:57 07/06/06 (0)

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