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05/04/24 at 22:35:45

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Sorry, have to share (Read 6329 times)

Lyndon

Ex Member

Sorry, have to share
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...

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Lyndon Ex Member	Re: Sorry, have to share Reply #1 - 12/02/09 at 21:30:10 Pic:
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Lon Seasoned Member "Love without guts is worthless!" Philip K. Dick Posts: 23584	Re: Sorry, have to share Reply #2 - 12/02/09 at 21:41:02 Congrats! Nice looking work.
Back to top	HR-1,ZBIT,ZROCK2,SEWE300B,CSP3-25mod; Rega RP3 all GrooveTracer mods;PSAudio:PST+DSD, DAC Mk II, P15,NPC,PowerBases,AC-12 pwr cbls, Reference spkrcbls; Mapleshade SamsonV3; VooDoo:Cremona+Amati interconnects, IsoPods; headphones: Sennheiser HD800S,ZMF Ori,Oppo PM1 IP Logged

Doorman Seasoned Member "pouring from the empty into the void" Posts: 450	Re: Sorry, have to share Reply #3 - 12/02/09 at 23:13:35 Yes, well done! The "industrial"(?) look is very nice! Best, Don
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dank

Seasoned Member

pair of dual 18
Imperials

Posts: 421

Re: Sorry, have to share
Reply #4 - 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

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Lyndon

Ex Member

Re: Sorry, have to share
Reply #5 - 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).

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