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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 9th October 2009, 05:38 PM   #51
ChrisA is offline ChrisA  United States
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Originally Posted by djn04 View Post
Regarding the efficiency of the ZRT's the tweeter is 92.5 and the woofer is 87. I'm not sure what that gets me but it's surely below 90.

My concern with the Simple SE is that I'll make it and it won't work well with the ZRT's.

Is there another easily made SET amp that would give me more power?
The first step is to clearly specify the amplifier you want. The key here, and it is hard to do ifyou are not used to thinking this way is the _specify_ and NOT design.

For example: You might say "The amp shall be a single ended design that can drive my 87db speakers to XX db listing level."

Plug in any value of "XX" you like. This will imply a level of power (watts) at the speaker terminals.

The next step is to find an output transformer that can meet you power requirement, then figure out what power tube(s) you need. For high power levels you may need to go with paralleled output tubes. if a single KT88 or EL34 is not enough.

If you don't like the result (because maybe four parallel KT88 tubes borders on the insane) then you are forced to chage the your written requirement. Maybe you eliminate the words "single ended" or lower the value of "XX". or change the speaker type.
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Old 9th October 2009, 06:09 PM   #52
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Originally Posted by djn04 View Post
Is there another easily made SET amp that would give me more power?
If you're looking for more power from an easy kit, I think you'll need to go Push-Pull or 300B for more power.
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Old 12th October 2009, 03:03 PM   #53
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If you are curious about how loud 7 or 8 watts is with your speakers (or 1 or 2 watts for that matter), and have access to a scope or averaging voltmeter, check out this thread:

Power Measurements at normal listening levels

If you can wire a scope across your speaker terminals and listen to music at various volumes on your existing setup, you can get a crude idea of what volumes to expect from low power SE.
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