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Old 9th March 2013, 07:58 PM   #1
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Default Ultimate spud amp - any ideas ?

Hi all,
I have built some nice fairly specialist amps over the last few years and I have some designs which I am really happy with and will be keeping. However they are in the 6-20W range and I recently concluded that my main speakers are only using a tiny amount of that power. I am thinking I could probably get by with between 1-3W and be more than happy.

So I am searching for a really special design for a nice Spud amp.
I have worked with the ECL82 before and have found it to be a really nice sounding tube - so its an option.
Of all the designs out there the Mighty Midget by Peter Millet strikes me as in best conformity with my design philosophy. However all my amps are now direct coupled and I would like to keep to that practice. However compactrons are a bit of a drag since they have to come from America.
I have seen a few single stage PP designs which i like the concept of, but they are not really spuds since they don't use dual triodes or pentodes.
Single stage designs are appealing.
Maybe an experiment in DHT ?

If I do this - Iwould like it to have the potential to better the amps I already have so this is something of a no holds barred though experiment.

Any ideas.

Shoog
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Old 9th March 2013, 09:23 PM   #2
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Not really a spud, but how about Gary Pimm's David monoblock?
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Old 9th March 2013, 09:47 PM   #3
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Quote:
Originally Posted by sesquialtera View Post
Not really a spud, but how about Gary Pimm's David monoblock?
I know Garys work having cloned the Tabor - but don't know this one. I will give it a search.

Just looked - not spud enough.

i rather like this;

http://4.bp.blogspot.com/-UNVKnfLGT4...00/6c45-pp.gif

Shoog

Last edited by Shoog; 9th March 2013 at 10:03 PM.
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Old 9th March 2013, 11:08 PM   #4
Cassiel is offline Cassiel  Libya
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PCL86 is another option, dirt cheap and great sounding.
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Old 9th March 2013, 11:51 PM   #5
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Decware Zenkit 1 is the PCB version of the Zen SE84 Amp. I built this. The cost is moderate (Edcor iron) the tube count is 3 and the imaging is astounding! 1.8W stereo into 8ohms; plenty for my fostex horns.
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Old 10th March 2013, 07:18 AM   #6
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Hi!

For me the 6HS5 is the ideal tube for a spud amp:

VinylSavor: Tube of the Month: The 6HS5

Best regards

Thomas
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Old 10th March 2013, 08:39 AM   #7
Stixx is offline Stixx  Germany
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A few mor 6C45 P schematics that I gathered over the years...
Attached Images
File Type: jpg 6C45_kugelis.jpg (351.3 KB, 571 views)
File Type: jpg 6C45pi_SE.JPG (145.5 KB, 556 views)
File Type: jpg 6C45PI_spud.jpg (166.2 KB, 549 views)
File Type: jpg 6C45-PP spud.jpg (119.0 KB, 544 views)
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Old 10th March 2013, 09:18 AM   #8
regal is offline regal  United States
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Spud amplifiers are as close to wire with a gain as you can get. They have a very special character.

Try a single EL55 per channel.

Use a SSHV2 per channel, bias it with Leds, Use a 2.5k:8 OPT the output impedance of the SSHV is so low that the power supply is out of the signal path Gives a very pure 2watts of power.
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Old 10th March 2013, 10:15 AM   #9
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Quote:
Originally Posted by Vinylsavor View Post
Hi!

For me the 6HS5 is the ideal tube for a spud amp:

VinylSavor: Tube of the Month: The 6HS5

Best regards

Thomas
I read this in my trawl and it looks amazing. However 1000v is a little offputting.

Shoog
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Old 10th March 2013, 10:16 AM   #10
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Quote:
Originally Posted by Stixx View Post
A few mor 6C45 P schematics that I gathered over the years...
Parafeed is out for me unfortunately.
DC compensated SE using PP transformers might be an option.

Shoog
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