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SE Output Transformer Matching
SE Output Transformer Matching
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Old 27th April 2006, 02:13 AM   #1
ttan98 is offline ttan98  Australia
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Join Date: Apr 2006
Location: Melb
Default SE Output Transformer Matching

As most are aware that most designs single ended 300B is quite straight forward.

What I notice in a no of designs is the use different output transformers with different impedances.

The 3 different impedances used are 2.5K, 3.5K and 5K. My question is, is there an optimun impedance, I believe sound quality is important(lower impedance give a fraction more power, higher impedance is better linearity) in this case?

Any thoughts out there, eg matching types of tube( include KT88 and EL34 and 2A3) with their respective impedances.
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Old 27th April 2006, 03:13 AM   #2
Tweeker is offline Tweeker  United States
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Join Date: Dec 2004
Location: Cincinnati, Ohio
The amplifiers operating point figures large in these questions. A higher B+ voltage lower bias current arrangement will likely favor a higher impedance etc.
Be sure your foil hat has a good low impedance ground.
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Old 27th April 2006, 05:28 PM   #3
ttan98 is offline ttan98  Australia
diyAudio Member
Join Date: Apr 2006
Location: Melb
I found this site all of you may be interested:


it details the matching of transformer impedance with 6550 tube.
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