FS: LM49710/LM49600 Amp (The Wire-ish) and +-15v Bipolar supply, 600:600 Transformers - diyAudio
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Old 11th July 2013, 08:33 PM   #1
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Default FS: LM49710/LM49600 Amp (The Wire-ish) and +-15v Bipolar supply, 600:600 Transformers

Up for sale is an amplifier that, much like a better version of "The Wire" headphone amp, uses 1 LME49710 TO-99 Metal can per channel for voltage gain, and 2 LME49600s for current gain. Feedback resistor has been left blank so you can choose your own gain (stock value 20k). Dale resistors, WIMA and Nichicon caps. Comes with a +15/-15v hand-built PSU that uses LM7815/LM7915 linear regulators, Nichicon MUSE electrolytics, MKP1841 decouplers, and IXYS diodes.

$100 OBO.

I have a suitable 115v/230v R-core transformer if you need it, $15 extra.

Also are some un-identified 600:600 interstage/output transformers that I bought on here awhile back from another user. I've been using them with a CS4397 and they sound pretty darn good. I upgraded to Jensens.

$40 for both OBO

Shipping and Paypal fees not included.

PM me!
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Last edited by wireswithgain; 29th July 2013 at 11:04 AM. Reason: corrected part number
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Old 15th July 2013, 03:50 PM   #2
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bump
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Old 16th July 2013, 06:28 PM   #3
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I might sell the headphone amp for a bit cheaper, someone make a reasonable offer. Keep in mind the op-amps alone are worth $40.
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Old 17th July 2013, 03:57 AM   #4
Mikett is offline Mikett  Canada
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Where can I see the schematic?
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Old 17th July 2013, 04:25 AM   #5
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Here's the schematic, very simple.
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Old 17th July 2013, 03:10 PM   #6
Mikett is offline Mikett  Canada
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Have you tested the circuit for any oscillation as per layout?
I am concerned about the sharing of the load and whether load resistors have been omitted.
Would you consider without the Power Supply?
Otherwise I am interested.
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Old 17th July 2013, 03:51 PM   #7
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I haven't hooked it up to a scope, but I didn't have any oscillation problems when I was using this board with the stock gain settings (21) to test it as a headphone amplifier. It sounded very detailed and dynamic and I didn't have any problems with it connected to my Sennheiser HD580s.

I'll sell it without the power supply. I'll PM you.
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Old 18th July 2013, 04:02 PM   #8
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Old 21st July 2013, 11:31 PM   #9
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Old 29th July 2013, 11:04 AM   #10
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