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This 'Spud' is no dud.

76.127.54.176
Posted on October 9, 2020 at 17:56:01
Ivan303
Audiophile

Posts: 48887
Location: Cadiere d'azur FRANCE - Santa Fe, NM
Joined: February 26, 2001
 OK, DIY in the form of a kit, but still...





Doc Bottlehead's 6FJ7 based 'Spud' amp (S.E.X or Single Ended Experimenters kit) can be used as either a headphone amp or 2 Watt 8 Ohm Single Ended amp suitable for REALLY high sensitivity speakers.

Somehow I managed to cobble it together and it actually worked.

And how!

Driving my 106dB EdgarHorns where 2 Watts should be plenty it has all of the 'poop' the horns require in a 360 Sq. Ft. space.

Better my 300B amp? Certainly quieter!

'SET Magic'? Indeed!

No hurry to go back to the 300B.

And I can plug in a headphone and it just cuts off the speakers and drives the headphones.












First they came for the dumb-asses
And I did not speak out
Because I was not a dumb-ass

 

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Thanks for the kind words!, posted on October 20, 2020 at 22:38:21
Paul Joppa
Industry Professional

Posts: 7296
Location: Seattle, WA
Joined: April 23, 2001
 Both of the triodes in a 6DN7/6FJ7 bottle are more linear than the usual dissimilar dual triode TV tubes - I sometimes say it's the poor man's 45 :^) Since we put in the better iron around a decade ago, I've been very happy with the sound.

I use mine in a bedroom/TV system, with 89dB JBL L36's.

 

You guys did a great job of designing it for low noise as well..., posted on October 21, 2020 at 06:11:19
Ivan303
Audiophile

Posts: 48887
Location: Cadiere d'azur FRANCE - Santa Fe, NM
Joined: February 26, 2001
Just did the C4S after a week or so of listening, but haven't tried it yet. Still on the bench but will run it today.

Plan to build a second one and bi-amp my horns. Maybe even add and active x-over.

It's that good.







First they came for the dumb-asses
And I did not speak out
Because I was not a dumb-ass

 

RE: This 'Spud' is no dud., posted on October 12, 2020 at 12:31:33
PakProtector
Audiophile

Posts: 12365
Joined: May 14, 2002
 Cute...learned something new: there is a 12-pin 6DN7 equivalent.
cheers,
Douglas

Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.

 

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