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Old 12th April 2003, 02:16 AM   #31
Joel is offline Joel  United States
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Default Re: High current drivers

Quote:
Originally posted by EC8010
...Once you start looking at the loadlines and real valve characteristics, the rule of thumb 10x doesn't seem quite so daft after all.
Hmmm... it seems more daft to me.

Frank - you feel that I act as though I have all the "right" answers, and that everyone else is ignorant? Sounds just like how I would describe you.

Perhaps you can see how I would think people telling me "always use a grunty driver" is just as dogmatic, and they bring the subject up far more than I do.

cheers.
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Old 12th April 2003, 09:31 AM   #32
316a is offline 316a  England
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Default 'drivers'

Mr 'Wimpy' is 100% correct , everyone else is daft , myself included . 10x is absolute overkill and will not improve the swing or distortion at all . I'm ripping out my meaty 2C50's and replacing them with 6SL7's . Do you think 100k anode loads with 175V HT will be enough to provide 100v p-p swing for my 6C33's ? 6C33's have 100k grid leak .


316a
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Old 12th April 2003, 02:48 PM   #33
Fuling is offline Fuling  Sweden
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I changed the circuit into a parafeed with a pentode CCS today, and it worked. 1,5W out before visible clipping, but the output signal seems to be slightly unsymmetrical.
Did some listening tests and decided that if I can find a suitable power transformer in my junkbox or get one really cheap, then IŽll build it. I donŽt wanna spend big bucks on this project.
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Old 12th April 2003, 03:08 PM   #34
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Default Good job.

I just get excited when my system works!

Rick
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Old 12th April 2003, 03:19 PM   #35
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Default BTW

Any chance you could post a simple schematic of your final design?

Thanks,
Rick
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Old 12th April 2003, 04:00 PM   #36
Fuling is offline Fuling  Sweden
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Due to the graphic nature of this schematic, viewer discretion is advised :
Attached Images
File Type: gif 6ew7-el86.gif (3.8 KB, 121 views)
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Old 12th April 2003, 06:46 PM   #37
7N7 is offline 7N7  United Kingdom
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Default Re: 'drivers'

Quote:
Originally posted by 316a
Do you think 100k anode loads with 175V HT will be enough to provide 100v p-p swing for my 6C33's ? 6C33's have 100k grid leak .


316a
Possibly - but only with a dab or two of "Tube-o-lator" (that's gone very quiet hasn't it!)

Finsihed that clock yet?

7N7
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Old 12th April 2003, 06:53 PM   #38
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Default Tube-o-later.

Hi,

LOL.

Bobken has suffered a blown Scanspeak tweetie that had to be ordered in from Denmark.
He must have had a bit too much "drive" somewhere along the line.

I expect he'll post his findings as soon asap.
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