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AUDIO FORUMS >> General Discussion and Support >> Sorry, have to share
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Message started by Lyndon on 12/02/09 at 21:27:45

Title: Sorry, have to share
Post by Lyndon on 12/02/09 at 21:27:45

Thanks for clicking. I just finished two Decware kits, a Zen headphone amp kit and an SE84C kit. I'm not new to kit-building, but this is my first experience with a true headphone amp, and it's my first SET amp also. The solder joints are still warm, and the SE84C is handcuffed by a pair of 89db bookshelf speakers (Vienna Acoustic Hayden), but both amps still sound TREMENDOUS. I'm blown away. I can't wait to hear what they sound like with a few hours on them.

I'll post more detailed impressions a little later. And don't worry, more efficient speakers are in the planning stages.

Pic in my next post...

Title: Re: Sorry, have to share
Post by Lyndon on 12/02/09 at 21:30:10

Pic:

Title: Re: Sorry, have to share
Post by Lon on 12/02/09 at 21:41:02

Congrats! Nice looking work.

Title: Re: Sorry, have to share
Post by Doorman on 12/02/09 at 23:13:35

Yes, well done!
The "industrial"(?) look is very nice!
Best, Don

Title: Re: Sorry, have to share
Post by dank on 12/03/09 at 00:55:14

Lyndon

Be sure that pin 6 of each output tube (shown as a n/c on the schematic) connects to pin 3 directly (normal) or through a .1 uf 400v capacitor (CCE mod). Some output tubes have this connection internally and some don't (6p15p). I think some boards have the connection (so it must be drilled to install the CCE mod) and some boards don't. If you have a board w/o the connection and you are using 6p15p tubes you only get about 1/2 watt output before it starts to distort (but it sounds great up to that 1/2 watt).

Also check the forum Zkit1 support section if you are getting hum thats louder than you think it should be.

DanK

Title: Re: Sorry, have to share
Post by Lyndon on 12/03/09 at 04:58:59

Thanks for the comments guys! "Industrial" hits it on the head. Lean and mean.

I performed the CCE mod as you suggested dank. The pcb came with a trace connecting pins 3 & 6 of the output tubes, so I cut it and soldered in a cap. I thought about waiting to do the mod until I'd heard the unaltered amp, but finally decided to do it from the get-go.

I don't hear any hum, even right next to the speaker (my speakers aren't very sensitive though).