Watts and Valves

Yes I pulled the PSU out of the main amp and stuck it in another box. Its on 3 phase cable because I need enough cores to carry the HT, heaters etc. etc. and it has to be something chunky to handle the voltages. Basically the psu and amp are hardwired together atm but to shift it I will need to seperate them (a better way of doing it anyway for the most part) but I never got round to fitting the socket to the psu so you'll need to do that. Its not a complicated job at all, you just need to check everything over to make sure before you hook up to go.

When your thinking of upgrading, PM me. I have an SE design you may like to try. Its easy on the ears and the wallet so a win win.
 
Current ........chunky enough to handle the current !!

You could use a multi pole plug and socket with a positive lock [bayonet ?] to improve flexibility. Or a xlr type with enough poles to do the same.
 
zanash said:
Current ........chunky enough to handle the current !!
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No, voltage. There are plenty of high current options out there but far less high voltage. Like I said, I have a 3 phase plug and socket which does the job fine.
 
45dht said:
hi i'm using a kel84 at the moment and was thinking of upgrading. what se are you using now?
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Its a 6em7 based amp. I can PM you a link to the original circuit if you like but I don't have it here (work)
 
johnfromnorwich said:
I guessed it would be - but that begs the question as to why so many mass market integrated amps are in the 50 - 100w range?
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Basically because of who they have to work with as partners. Mostly acoustic suspension or ported reflex cabinets.

But watts are largely meaningless nonsense, double watts for 3db gain. So 2 to 4 watts means extra 3db and so does 50 to 100 watts. Non linear exponential curves always require a little latteral thought. Blame whoever designed the human ear :D

Richard
 
http://www.the-planet.org/6EM7.html

Thats where the idea came from, mine is different as I just built it out of what I had to hand. Basically the same though. Keep meaning to try his PSU circuit out as it looks right nice.
6em7 is kind of like a 6SN7 and a 2A3 in one envelope (a 'dissimilar dual triode'). So you've basically got both of your amp stages in one tube. I got most of the info from some of the guys over on WAD so tbh I'm just faking knowing what I'm talking about :) Its easy to build though with a nice low component count.
 
that looks pretty easy all except the psu that is. i've tried to find some chokes with those specs but have found nothing with 12H@75ma390ohm dcr what psu are you using and where did the chokes come from? i'm definately interested in having a go at building one. is it a Directly Heated Triode then like a 2a3?
 
zanash said:
Ok some one can correct me ......

the reason small watt valve amps sound good and are able to drive 89db speakers is the output transformer this is a resovoir of energy ...solid states do not normally go this route as output transformers are very expencive. So the solid state needs to derive its power from somewhere ...ie in sheer output device grunt.

valves are a very good move .....!
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Are you sure?
i think it depend's frequency extension and harmonic structure.
but i'm not sure
 

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