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Old 2nd October 2010, 10:40 AM   #1
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Default splitter/driver stage

Hi i am building a 75/100 watt Hi Fi amp using pp kt88's i was attracted to the long tail option splitter/driver but noticed a lot of guitar amps use this, now i am wondering what other people use for Hi Fi. Regards Willy.
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Old 2nd October 2010, 12:03 PM   #2
Brit01 is offline Brit01  United Kingdom
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I'm just about to implement this LTP in an OTL design I'm creating.

I will try using a small pentode with high Rp as the tail resistor to get the 2 outputs as balanced as possible. Another option I know is a good neg voltage regulator as a CCS.

In my case for an OTL I need perfectly balanced inverted outputs.
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Old 2nd October 2010, 12:21 PM   #3
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Quote:
Originally Posted by cone head View Post
Hi i am building a 75/100 watt Hi Fi amp using pp kt88's i was attracted to the long tail option splitter/driver but noticed a lot of guitar amps use this, now i am wondering what other people use for Hi Fi. Regards Willy.
So are u saying b/c guitaramps use it, u shouldn't for HiFi? A LTP phase splitter works fine.
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Old 2nd October 2010, 01:33 PM   #4
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Originally Posted by SemperFi View Post
So are u saying b/c guitaramps use it, u shouldn't for HiFi? A LTP phase splitter works fine.


no just that most reading i've done about LTP has been to do with guitar amps and they do seem to have narrower band width and muso's seem to like that grungier sound i think that's what put me off but leak used them also they appear technically better than the common see saw so righto i'll go with the LTP.
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Old 2nd October 2010, 01:49 PM   #5
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For a number of good reasons, only 2 topologies are in vogue for HIFI splitter duty: the LTP and the "concertina". Given its "unity" gain, "concertina" topology presents problems in driving powerful tubes, like the KT88. Williamson style circuitry, with its differential gain block following the "concertina", deals with the issue. However, controlling instability in Williamson style circuitry can be quite tricky and expensive.

Dig into the archives for Mullard style circuitry, as (IMO) that will give you maximum opportunity for success.
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