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Old 31st December 2008, 12:06 AM   #651
HKC is offline HKC  Hong Kong
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Just finished my John Curl's JC-2 clone pre-amp, here are some pictures
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Old 31st December 2008, 12:08 AM   #652
HKC is offline HKC  Hong Kong
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Another picture
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Old 31st December 2008, 12:12 AM   #653
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Top view of the pre-amp
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Old 3rd January 2009, 10:24 AM   #654
Bonsai is offline Bonsai  Taiwan
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Default Bonsai's Pre-amp

Here are some pictures of my pre-amp which I have partially completed. The main control amp is based on an LM4562 single ended to balanced design with a gain of approx 3. All inputs are relay switched with control via a swtich located on the LHS of the front panel. I use an Alps Blue Velvet pot (10k - I also like lowish value potentiometers - and with a bipolar input op-amp, this gives better noise performance). For the power supply, I used an Amveco transformer (very low mechanical noise and much better I discovered than the Block transformer brand in this regard). Main supply is built around LM317/337. Each op-amp supply is further decoupled with a 22 Ohm and 100uF. In series with each balanced output, I have 50 ohms to isolate cable capacitances .

The pre-amp input to output is DC coupled, but no servo is necessary.

For the headphone amp, I am driving a diamond buffer stage straight from the pre-amp output stage, so no gain. I have used capacitive coupling on the output of the headphone amp.

I've mounted the phono board, but its not yet complete - I still have to get some parts - its based heavily on Dennis Collin's design out of Audio Amateur. On each input, I have a 10 way DIL switch for selectable cartridge loading. The supply lines on the op-amps on the phono card are also decoupled with 22 ohms and 100uF.

I am playing it through my power amp and driving a pair of B&W 703's and I must say the sound to my ears is very good - clean, open with great bass. I listen mainly to jazz, classical and light rock.

CD player is a Pioneer DV-655A which does SACD as well.

Dimensions are 450mm (W) x 300 (D) x 100 (H) and weight is around 5Kgs.
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Old 3rd January 2009, 10:26 AM   #655
Bonsai is offline Bonsai  Taiwan
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Above is a shot od the phono amp (also uses LM4562). Next shot is front view.
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Old 3rd January 2009, 10:27 AM   #656
Bonsai is offline Bonsai  Taiwan
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Rear View
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Old 3rd January 2009, 10:39 AM   #657
fotios is offline fotios  Greece
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Default Nice!

Hi Bonsai and happy new year

Wow! Another one amazing Bonsai project! My compliments sir!
Nice "Modu" case and solid knobs! Nice "Neutrik" phono sockets!
Give us more food!
I would like a shot from above the unit... pleeeease!

Regs
Fotios
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Old 3rd January 2009, 10:40 AM   #658
Bonsai is offline Bonsai  Taiwan
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Internal shot of the main amp and regulator board.
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Old 3rd January 2009, 10:43 AM   #659
Bonsai is offline Bonsai  Taiwan
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Finally, sitting next to the power Amp. Lots of cables, but I have a very tolerant wife. CD player is in the cupboard below.
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Old 3rd January 2009, 10:48 AM   #660
fotios is offline fotios  Greece
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Quote:
Originally posted by Bonsai
Internal shot of the main amp and regulator board.
First class parts inside!
Cornell-Doubilier silver mica caps, Panasonic (blue=low ESR) electrolytics etc... resistors are Vishay?
In the front, the 4 small yellow parts are NAIS relays? Or Panasonic? What type are you using?

Fotios
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