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In Reply to: Re: Very soft bass - scratching my head posted by single_ended on March 1, 2007 at 12:26:08:
The grid choke on the earlier stage will give you a mild boost in the upper mids and highs suggesting that the overall bass is weak. A grid choke should really only be used on a power tube to compensate for a weak high frequency throughput. With an IST a choke cannot be used of course.I would still change the driver tube to a 2A3 and retain the IST using the present arrangement. The weakness at the moment is that there will not be enough drive using a hi Rp tube. You really need an Rp of around 300 ohms to make this work. I use the 2A3 driving a Tango NC14 5k:5k and it will drive a 211. I have also used a 6C19 pushing 50mA to drive a 300B with plenty of headroom. What you have now barely works and has no headroom whatsoever and will sound weak on dynamic passages.
JohnR
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- Re: Very soft bass - scratching my head - J.Rankin 00:23:34 03/02/07 (0)
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