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Old 2nd December 2010, 04:13 PM   #91
Salas is offline Salas  Greece
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Quote:
Originally Posted by Ivey View Post
OK Salas, this is what I will do.

My grandson and I, will breadboard the unit.

I will use 2N5088 in the front end.

2N3904/6 for all the others. That transistor has a max. db factor of 4.5. Max.!

And I will use a BC139-16.

Metal film polyesters @ 10%. Use polypro's in the final build.

So what do you think of that?

Take Care

Ivey

Sounds like a plan. Riaa caps quality & tolerance is irrelevant in this phase. Your MKTs will do fine. All you need to know is that it will bias correctly and no one stage loop will oscillate. This is a 60dB gain circuit. Will play 0.25mV to 0.5mV MC carts if all goes well. You got such a cartridge?
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Old 2nd December 2010, 11:47 PM   #92
Ivey is offline Ivey  United States
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Default MC Cartridges...,no

I have Pickering V-15 carts, three of them and nine needles for them. Plus one Graddo cartridge, with one extra needle.

I need a MC cartridge, so I will invest in one.

Take Care

Ivey
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Old 2nd December 2010, 11:55 PM   #93
Salas is offline Salas  Greece
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A Denon DL103 will not set you back for much, and will give a good taste of LowMC world. Although vintage in tone, not super resolution, has quite a following. A classic. Its real compliance is 16cu to check compatibility with your tone arm. Has 40 Ohm source impedance and if you go for it, make R1 (input load resistor) 430R. If you have in mind a bigger investment there are many options and takes some investigation. Regards.
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Old 18th December 2010, 05:24 PM   #94
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Quote:
Originally Posted by Ivey View Post
OK Salas, this is what I will do.

My grandson and I, will breadboard the unit.


Ivey
I wish I had a grand father like you Ivey . Great reading and info you have provided here. Fun to read. Thanks.
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Old 2nd January 2011, 03:58 PM   #95
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Hi Ivey
How schould this work?! You ar shortening the input with 1uF to ground!
albatros49
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Old 2nd January 2011, 04:31 PM   #96
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Default 2N2222A as preamp transistor

Hi, what about BC413-BC415?!
Ever tried them?
Noise is 1,2db

Greetings
albatros49
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Old 14th May 2012, 05:24 PM   #97
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What happened to this thread?
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Old 14th May 2012, 06:39 PM   #98
sonidos is offline sonidos  United States
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Several months ago I saw a post from Ivey's grandson, IIRC. It didn't sound like Ivey was doing well health-wise and so maybe he no longer has the energy to respond.
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Old 17th May 2012, 02:19 AM   #99
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Damn! Is anyone building this?
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Old 17th May 2012, 05:11 AM   #100
Ivey is offline Ivey  United States
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Default Ill but still kicking

Hello everyone:

I am Joe, the great grandson of Ivey.

my great grandfather is slowly recovering from his illness. We are trying to keep him as inactive as possible to prevent a future heart condition.

I talk to him often, and we always talk electronics, since I am going to college and following his path into electronics.

My great grandfather has tons upon tones of electronic parts, equipment, and a technical library that I hope to inherit. But even now, I have the run of the place, and the time I spent there is endless.

I build his 2N2222A phono amp, to replace the one he built years earlier. But I used the 2N4401 because I came across the complete spec's on the transistor, showing dies, and a host of other information, that shows that it is far better than the 2N2222A, and it has far better gain, and it Nb is a Max 4

Any away, I do not have much time so I posted my PCB layout using a a better gnd area. And I mirrored the image for both channels.

If you have the schematic the layout is straight forward. If not, I could label and id everything later on down the road.

so long

Joe
Attached Files
File Type: pdf C-PHONO9.PCB.pdf (12.2 KB, 170 views)
File Type: pdf B-PHONO9.PCB.pdf (10.5 KB, 120 views)
File Type: pdf T-PHONO9.PCB.pdf (4.9 KB, 109 views)
File Type: pdf PN2222A.PDF (174.8 KB, 143 views)
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