Hagerman Tech. 'bugle' phono preamp

lgreen · 1st March 2007, 02:02 AM

Completed the 'bugle' phono preamp. Gotta say it was easy to make, sounds good (just finished tonight) and was very cheap. I think the board was $39 and the parts were about $25, though I already had some of the more expensive parts (switches and caps).

Links and pics on the link below.

Link to Web Page

Agent327 · 1st March 2007, 09:13 AM

Yes!

I agree, a very nice phono amp.
I have made one 'dead bug' style and put it inside a Dual turntable with a DL110 cartridge for a niece.
Even with this modest setup it is a pleasure to play records.

Kees

JWFokker · 12th March 2007, 05:06 PM

I just got my Bugle PCB today. Anyone have any ideas to "enhance" it? I'm not familiar with opamps to know which are better (and drop in replacements) than the OPA2134. Any other modding ideas are welcome too. Because my understanding of circuits is limited, I don't know if replacing the capacitors with better quality caps or higher values would improve the sound quality.

JWFokker · 13th March 2007, 03:39 AM

I emailed Jim Hagerman about potential "performance enhancements" for the Bugle and I'll post whatever I find out here.

JWFokker · 13th March 2007, 05:36 AM

I got a response back, but no dice. The word from Jim is to use teflon caps and experiment with opamps for any noticable improvement.

Agent327 · 13th March 2007, 09:17 AM

Well, maybe selecting the equalization caps and R's to a very close tolerance could improve stereo focus, but I have no idea what tolerance is required. 0.01%? or 5%?

Does anyone have an informed opinion on that matter?

Cheers.

JWFokker · 13th March 2007, 03:46 PM

I had given that some thought. Wellborne labs does match caps if you don't have a capacitance meter. It's useful to me because I don't.

1st March 2007, 02:02 AM	#1
lgreen diyAudio Member Join Date: May 2003 Location: San Diego, USA	Hagerman Tech. 'bugle' phono preamp Completed the 'bugle' phono preamp. Gotta say it was easy to make, sounds good (just finished tonight) and was very cheap. I think the board was $39 and the parts were about $25, though I already had some of the more expensive parts (switches and caps). Links and pics on the link below. Link to Web Page __________________ My DIY audio projects- PartTimeProjects.com.

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1st March 2007, 09:13 AM	#2
Agent327 diyAudio Member Join Date: Nov 2004 Location: Utrecht, Netherlands	Yes! I agree, a very nice phono amp. I have made one 'dead bug' style and put it inside a Dual turntable with a DL110 cartridge for a niece. Even with this modest setup it is a pleasure to play records. Kees

12th March 2007, 05:06 PM	#3
JWFokker diyAudio Member Join Date: Feb 2005 Location: Kingston, NY	I just got my Bugle PCB today. Anyone have any ideas to "enhance" it? I'm not familiar with opamps to know which are better (and drop in replacements) than the OPA2134. Any other modding ideas are welcome too. Because my understanding of circuits is limited, I don't know if replacing the capacitors with better quality caps or higher values would improve the sound quality.

13th March 2007, 03:39 AM	#4
JWFokker diyAudio Member Join Date: Feb 2005 Location: Kingston, NY	I emailed Jim Hagerman about potential "performance enhancements" for the Bugle and I'll post whatever I find out here.

13th March 2007, 05:36 AM	#5
JWFokker diyAudio Member Join Date: Feb 2005 Location: Kingston, NY	I got a response back, but no dice. The word from Jim is to use teflon caps and experiment with opamps for any noticable improvement.

13th March 2007, 09:17 AM	#6
Agent327 diyAudio Member Join Date: Nov 2004 Location: Utrecht, Netherlands	Well, maybe selecting the equalization caps and R's to a very close tolerance could improve stereo focus, but I have no idea what tolerance is required. 0.01%? or 5%? Does anyone have an informed opinion on that matter? Cheers.

13th March 2007, 03:46 PM	#7
JWFokker diyAudio Member Join Date: Feb 2005 Location: Kingston, NY	I had given that some thought. Wellborne labs does match caps if you don't have a capacitance meter. It's useful to me because I don't.

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