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Old 8th April 2013, 06:41 PM   #2031
pdul is offline pdul  Denmark
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Quote:
The only problem is that I don't have enough of those 410-429 Hfe parts to build both channels. I guess I will have to order another batch of parts and keep matching.
According to your own post, you have 10 of each, and you need 8 of each for both channels
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Old 9th April 2013, 03:29 AM   #2032
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Quote:
Originally Posted by hesener View Post
thank you , looks great! I was looking at the cartridgeman "conductor" arm, doesnt have VTA adjustment though, and is more expensive....

The Cartridge Man Conductor Air Bearing Tonearm
Thanks. That is a nice arm. I was fairly deep in my build when a used MG-1 became available with two arms, so I stuck an armboard at left rear of table. My initial plan was for a 12 Moerch DP6 I have.

Have you looked at the Trans-Fi Audio Terminator? The T3Pro sells for 770 GBP or $1175US. It has VTA.

Terminator Tonearm - Trans-Fi Audio

David over at Lenco Heaven likes it a bit better than the MG-1.

http://www.lencoheaven.net/forum/index.php?topic=2805.0
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Old 9th April 2013, 07:56 AM   #2033
Cobra2 is offline Cobra2  Norway
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Great mounting of the MG-1! I want one too, when they give in, and make a "mirrored" version! The Terminator looks promising, but IMHO; the arm is too short, and I do not like the "slead" so much over the record.

Arne K
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Old 10th April 2013, 09:51 AM   #2034
hesener is offline hesener  Germany
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For all those paradise builders out there - PLEASE REMEMBER TO ADJUST THE INPUT OFFSET with the trimpot right next to the input pins. You can do this with open input (just the DMM connected), and it will not be very stable, but you should be able to get it to below 100mV, and then you connect a 10k resistor and just move it a little bit to get it to zero.

Tried it yesterday, it makes a HUGE HUGE difference in terms of clarity, sound quality and sheer enjoyment.

In fact, my own (beta) paradise does not have input offset adjustment, and I was kind of getting used to the not so great sound apparently, but that experiment was a true eye-opener....
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Old 10th April 2013, 09:55 AM   #2035
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It is not only the minimized DC offset at the input that makes the sound better.
It is in fact a feedback loop that lowers distortion.
Thanks Alfred that you tried this out.
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Old 10th April 2013, 09:57 AM   #2036
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Hi Alfred,
is there any news on the "oscillators" ?
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Old 10th April 2013, 10:53 AM   #2037
ungie is offline ungie  Canada
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Originally Posted by pdul View Post
According to your own post, you have 10 of each, and you need 8 of each for both channels
Yes of course, and you have discovered that I can't count! I had somehow thought I needed 8pcs of NPN and PNP for EACH channel.
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Old 10th April 2013, 11:08 AM   #2038
hesener is offline hesener  Germany
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Originally Posted by Benedetto View Post
Hi Alfred,
is there any news on the "oscillators" ?
Please check out the updated assembly guides (links in my signature), these now have instructions on the amplifiers oscillating, the RIAA values, and the input offset trim.

Remember, only 1 (!) verified case of amplifiers oscillating... This should only be done when you really measure signals in the 70...100MHz range (and they are not coming from the radio station next door )
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Old 11th April 2013, 11:32 AM   #2039
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Quote:
Originally Posted by hesener View Post
For all those paradise builders out there - PLEASE REMEMBER TO ADJUST THE INPUT OFFSET with the trimpot right next to the input pins. You can do this with open input (just the DMM connected), and it will not be very stable, but you should be able to get it to below 100mV, and then you connect a 10k resistor and just move it a little bit to get it to zero.

Tried it yesterday, it makes a HUGE HUGE difference in terms of clarity, sound quality and sheer enjoyment.

In fact, my own (beta) paradise does not have input offset adjustment, and I was kind of getting used to the not so great sound apparently, but that experiment was a true eye-opener....

Folks

Alfred talks about my boards. You are remember my problems:
Originally Posted by hesener Click the image to open in full size.
Hi Werner, can you confirm that the input voltage (measured at the input pins) is +2.5V, and the output voltage is +15V? How about VCASCH and VCASCL, and the voltages across the 6800uF caps?

Hi Alfred, I have just measured (Fluke 787)
UPLUS = -18,13
UMINUS= +18,13
INPUT = +2,48
OUTPUT= +15,23
VCASCH= +14,49
VCASCL= -14,56
Across the 6800 uF caps plus side +1,73
Across the 6800 uF caps minus side -3.16
EXI RIAA= +15,23

Alfred ask me to send the boards over to him for a check and he found
that I have forgot to adjust THE INPUT OFFSET . My fault. He adjust
it for me, measured all importend things, and told me that everything it
perfect now!!!
When I have the boards back in Ireland and Peters power supply is finished I will give same sound impressions.
Alfred thanks a million you do a grand job and thanks to all other lads for help
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Old 11th April 2013, 11:39 AM   #2040
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Great. Another brick in the wall.
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