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#377645 - 05/31/12 03:13 PM Re: Gonna Try Building a 1kW Class D Amp for Only $396 [Re: SRoode]
2x6spds Offline
connoisseur

Registered: 03/16/02
Posts: 2726
Loc: CA, USA
Originally Posted By: SRoode
One thing I have noticed over the last week or so of listening is that the I-Phone just does not have enough "umph" to serve as an adeqaute pre-amp. When I hooked my Onkyo receiver up to the amp and used the pre-outs, I was really able to push the amp and the sound was great. So, I decided to hunt around for a little pre-amp (or headphone amp) for the amp I built. I finally decided on this one:

http://www.ebay.com/itm/Indeed-G3-Headph...=item3a699d3c70

It's a tube pre-amp/headphone amp, and it looks like a tweaker's wet dream. Some guys on another board had a chance to play with it and some have even modded it a bit:

http://rockgrotto.proboards.com/index.cgi?board=b&action=display&thread=7174#

It's on it's way from Hong Kong right now, but it won't be here for a couple of weeks. Has anyone here had any experience with this unit? I know some of you are into headphone amps.


A tube preamp is a great idea for a class D amp. However, a headphone amp limits you to a single source input.

I picked up a TCC TC 754 solid state preamp from Amazon.com for my Dayton DA100(?) Class D amp.



It works very well and has multiple inputs.
_________________________
Enjoy the Music. Trust your ears. Laugh at Folks Who Claim to Know it All.

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#377654 - 05/31/12 07:03 PM Re: Gonna Try Building a 1kW Class D Amp for Only $396 [Re: 2x6spds]
SRoode Offline
connoisseur

Registered: 03/20/08
Posts: 1200
Loc: Fishers, Indiana, USA
I actually saw that one and several others when I was looking around. The problem (for me) with the TC754 is that it is a 0 gain preamp, the volume control only attenuates. I needed something that would give me a pre-amp boost to help with the really low input signal of the I-phone. The pre-amp I ordered has a 20 db gain.
_________________________
2 M80s, 1 VP180, 4 QS8s, 2 EP800s, 4 Algonquins, 2 M3 VaSSallos

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#377681 - 06/01/12 01:42 PM Re: Gonna Try Building a 1kW Class D Amp for Only $396 [Re: SRoode]
SRoode Offline
connoisseur

Registered: 03/20/08
Posts: 1200
Loc: Fishers, Indiana, USA
I'm giggling like a little schoolgirl!


_________________________
2 M80s, 1 VP180, 4 QS8s, 2 EP800s, 4 Algonquins, 2 M3 VaSSallos

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#377697 - 06/01/12 04:09 PM Re: Gonna Try Building a 1kW Class D Amp for Only $396 [Re: SRoode]
MarkSJohnson Offline
shareholder in the making

Registered: 09/27/04
Posts: 10670
Loc: Central NH
Cool!
_________________________
::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::

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#377709 - 06/01/12 06:43 PM Re: Gonna Try Building a 1kW Class D Amp for Only $396 [Re: SRoode]
2x6spds Offline
connoisseur

Registered: 03/16/02
Posts: 2726
Loc: CA, USA
Hey! That's my cigar humidor?!?
_________________________
Enjoy the Music. Trust your ears. Laugh at Folks Who Claim to Know it All.

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#377710 - 06/01/12 06:58 PM Re: Gonna Try Building a 1kW Class D Amp for Only $396 [Re: SRoode]
SRoode Offline
connoisseur

Registered: 03/20/08
Posts: 1200
Loc: Fishers, Indiana, USA
Since there was a Cohiba in the box beforehand, I refuse to answer on the gorunds that it may incriminate us... wink
_________________________
2 M80s, 1 VP180, 4 QS8s, 2 EP800s, 4 Algonquins, 2 M3 VaSSallos

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#377711 - 06/01/12 07:08 PM Re: Gonna Try Building a 1kW Class D Amp for Only $396 [Re: SRoode]
tomtuttle Offline
axiomite

Registered: 06/20/03
Posts: 8130
Loc: Tacoma
Very cool, Steve!
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bibere usque ad hilaritatem

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#378249 - 06/10/12 08:15 AM Re: Gonna Try Building a 1kW Class D Amp for Only $396 [Re: SRoode]
SRoode Offline
connoisseur

Registered: 03/20/08
Posts: 1200
Loc: Fishers, Indiana, USA
The Pre-amp arrived in the mail yesterday, on 12 days from Hong Kong, not too bad! The difference having a pre-amp in line with the amp is really night and day. I'm really able to drive the speakers now, and I have not even attempted to turn the volume all the way up (I have had it as high as about 60% and that was more than enough). I've also tried using it as a headphone amplifier and it sounds great that way as well. There are only 2 issues I have with it, and I knew about them before I bought it. First, the black heatsinks get INCREDIBLY hot. I shot them with my infrared thermometer, and they were about 75C. Since this is a class A amp, it seems to always be this temperature when on, regardless of the listening volume. Supposedly this temperature is okay. The next issue is interference. Since the amp is not in a shielded enclosure, you do not want to bring yor iPhone within about 8 feet of this amp. One of the guys on another board fixed this by plating the top and bottom acrylics with aluminun foil and tying it all to a common ground. I may enclose it in the future, but for now it's okay since I play music from my iPhone to a Bluetooth receiver... No issues with that.

Anyway, I love the pre-amp. It's a great deal for $119 shipped.



_________________________
2 M80s, 1 VP180, 4 QS8s, 2 EP800s, 4 Algonquins, 2 M3 VaSSallos

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#378250 - 06/10/12 08:38 AM Re: Gonna Try Building a 1kW Class D Amp for Only $396 [Re: SRoode]
Ken.C Offline
shareholder in the making

Registered: 05/03/03
Posts: 17695
Loc: NoVA
Neat lookin' little thing! Glad you're enjoying it all.
_________________________
I didn't do it, no one saw me, you can't prove anything.

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