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Old 13th May 2018, 05:01 AM   #1091
wayne is offline wayne  United States
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I can try running it into eight Ohms and see what happens. The bias is a bit low for class A into eight.
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Old 13th May 2018, 07:00 PM   #1092
alwineden is offline alwineden  Canada
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Originally Posted by nzlowie View Post
I've been looking for a really nice sound ding low power amp to drive my horn's, could I use something like this or would this struggle to drive 8 ohms?

Thanks

I'm currently using 2.2R source resistors to drive 8R speakers and it works fine. Loading the schematic into Spice suggests 4R speakers will be poor unless you double up on the Fets.



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Old 15th May 2018, 10:45 PM   #1093
wayne is offline wayne  United States
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I tried it into 8 Ohms and the distortion goes up to about .15% at a couple of Watts. The harmonics are pretty high but it does work. Very efficient speakers recommended and like above smaller source resistors are better.
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Old 15th May 2018, 10:50 PM   #1094
Zen Mod is offline Zen Mod  Serbia
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I tried it .....
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Old 17th May 2018, 12:03 AM   #1095
alwineden is offline alwineden  Canada
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Look, a clown.


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Old 18th May 2018, 03:41 PM   #1096
mod_sonic is offline mod_sonic  United Kingdom
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Default Transformer Snubber C20

Hi 6L6,

Can you please point me to a suitable transformer snubber, C20 ? I am not sure what I am looking for, and there's no Mouser or other code in the BOM.

Thanks

Mark
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Old 18th May 2018, 03:50 PM   #1097
6L6 is offline 6L6  United States
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Sure!

Kemet R46KN322000M1M


R46KN322000M1M KEMET | Mouser
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Old 18th May 2018, 03:56 PM   #1098
mod_sonic is offline mod_sonic  United Kingdom
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Default C20 and the Pot

6L6,

'Faster than a speeding bullet....' :-) Thanks for a quick response on C20.

What can you tell me about the Pot value please. The schematic says 20-100K which is the first time I have ever seen a value range. Can you offer any guidance please ?

Thanks

Mark
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Old 18th May 2018, 04:06 PM   #1099
6L6 is offline 6L6  United States
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Good potentiometers are getting progressively more difficult to source as all things march further and further towards becoming digital. And some people want to use stepped attenuators instead of pots. So our choice is somewhat limited.

The long story made short is that the value is not super critical, however if much lower than 20K the input impedance can get hard for some sources to drive, and if higher than 100K there can be interesting interactions with input capacitance. In either case, falling outside the range might make it difficult for your sources to drive.
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Old 18th May 2018, 04:53 PM   #1100
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conclusion - just go with 600R attenuators

sources unable to drive that are for Sissies

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