Triode and Input Transformer

mr2racer · 01:57 AM

Hi Everyone,

I have a pair of Dynaco Mark VI's And I'm not happy with the way they sound. They have a 12AU7/12AU7 front end and have been converted to KT88's.

I want to soften or sweeten up the sound. I've been reading about input transformers. It seems with a tube they are essentially a single ended amplifier.

Could you use a small single ended output transformer as an input transformer?

I was thinking of using a triode and an input transformer for the front end. Is there a triode that could drive four KT88's? And does anyone have any recommendations for transformers?

Is this a stupid idea?

EddieRich · 01:11 PM

I used an input transformer for my first amp, a simple mp3 player dock. I used a 200:8 transformer, but wired it backwards. In other words, the headphone output from my mp3 player is wired to the 8 ohm winding, and the 200 ohm winding drives the grid of the tube.

It's not a hi-fi amp, but the idea definitely works. I got the tranformer from mouser.com, but you could use the 1K:8 from radio shack.

here is the link ... Photo Gallery

Visit adams page ( the link is in the above post ), he did a mono amp with transformer input to drive 2 60FX5's in push-pull.

mr2racer · 22nd June 2012, 10:57 PM

Thanks, talked to David at Cinemag, fixed me right up!

22nd June 2012, 01:54 AM	#1
mr2racer diyAudio Member Join Date: Jul 2009	Triode and Input Transformer Hi Everyone, I have a pair of Dynaco Mark VI's And I'm not happy with the way they sound. They have a 12AU7/12AU7 front end and have been converted to KT88's. I want to soften or sweeten up the sound. I've been reading about input transformers. It seems with a tube they are essentially a single ended amplifier. Could you use a small single ended output transformer as an input transformer? I was thinking of using a triode and an input transformer for the front end. Is there a triode that could drive four KT88's? And does anyone have any recommendations for transformers? Is this a stupid idea? Last edited by mr2racer; 22nd June 2012 at 01:57 AM.

22nd June 2012, 01:06 PM	#2
EddieRich diyAudio Member Join Date: Jun 2011 Location: North of Boston	I used an input transformer for my first amp, a simple mp3 player dock. I used a 200:8 transformer, but wired it backwards. In other words, the headphone output from my mp3 player is wired to the 8 ohm winding, and the 200 ohm winding drives the grid of the tube. It's not a hi-fi amp, but the idea definitely works. I got the tranformer from mouser.com, but you could use the 1K:8 from radio shack. here is the link ... Photo Gallery Visit adams page ( the link is in the above post ), he did a mono amp with transformer input to drive 2 60FX5's in push-pull. Last edited by EddieRich; 22nd June 2012 at 01:11 PM.

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22nd June 2012, 10:57 PM	#3
mr2racer diyAudio Member Join Date: Jul 2009	Thanks, talked to David at Cinemag, fixed me right up!