Somebody knows anything about this project from diyzone?
http://forum.diyzone.net.cn/viewtopic.php?t=52629&sid=771acb2e86423ad65eb90a7d878d2d84
http://forum.diyzone.net.cn/viewtopic.php?t=52629&sid=771acb2e86423ad65eb90a7d878d2d84
Attachments
It has been a hot item in many topics over here:
http://www.google.com/search?hl=nl&...G:nl&q="Marantz+7C"+site:www.diyaudio.com&lr=
/Hugo
http://www.google.com/search?hl=nl&...G:nl&q="Marantz+7C"+site:www.diyaudio.com&lr=
/Hugo
It is nice, but assembling a kit, sold by people whose sole purpose is to make money by ripping off others is not really encouraged over here.
/Hugo
/Hugo
Josep said:
Maybe not. The 7C had a pretty good phono stage and a very mediocre line stage. Its claim to fame is based mostly on collectors value.
Four (4) caps along the signal?!! ECC83 follower!!! I bet it only sounds good with TFKs 🙂
Josep,
You better go with an Aikido from John Broskie at:
http://www.tubecad.com/2006/05/blog0064.htm
Choose your input tubes depending of the gain needed
and you'll get better results than the Marantz 7 preamp!!! 😉
Even without a PCB the results will be higher quality and bandwidth!!
And there are on Tubecad many PS's to choose from.
As Analog_sa said: " the Marantz 7 is good for his collector value,
not for his preamp stage... "
And most, avoid diyzone
Regards.
Alain.
You better go with an Aikido from John Broskie at:
http://www.tubecad.com/2006/05/blog0064.htm
Choose your input tubes depending of the gain needed
and you'll get better results than the Marantz 7 preamp!!! 😉
Even without a PCB the results will be higher quality and bandwidth!!
And there are on Tubecad many PS's to choose from.
As Analog_sa said: " the Marantz 7 is good for his collector value,
not for his preamp stage... "
And most, avoid diyzone
Regards.
Alain.
1 1/2 12AX7 and massive feedback!
The tube amps the likes of Marantz did in the 1950-60s are the equals to the ss amps the Japanese electonics giants did in the 1970s. Not bad, but you can do a helluva lot better.
Go Akido.
The tube amps the likes of Marantz did in the 1950-60s are the equals to the ss amps the Japanese electonics giants did in the 1970s. Not bad, but you can do a helluva lot better.
Go Akido.
Of all the preamps to copy, not that one!
...It's phono preamp isn't bad but the post volume control circuits are veiled. The Audio Research SP-3-6 is basically am offshoot of this. They both evolved from an original Westrex circuit which in some ways was superior to either the Marantz or the Audio Research.
...It's phono preamp isn't bad but the post volume control circuits are veiled. The Audio Research SP-3-6 is basically am offshoot of this. They both evolved from an original Westrex circuit which in some ways was superior to either the Marantz or the Audio Research.
gain is the problem
I had made one such preamp...through a chinese source. The problem is the gain...it is too much for my setup.
Any ideas on how the gain can be lowered ? Changing the output buffer valve to 12AT7 or 12AU7 does not seem to help much either...
Regards
Sandy.
I had made one such preamp...through a chinese source. The problem is the gain...it is too much for my setup.
Any ideas on how the gain can be lowered ? Changing the output buffer valve to 12AT7 or 12AU7 does not seem to help much either...
Regards
Sandy.
Re: gain is the problem
You'd have to add a resistor network to attenuate the input gain. Its way too high when used with cd source.
Sorry, I can't recall the actual values as it was implemented successfully for a friend who complained that 3 clicks of the step attenuator (built in volume control) was already too loud.
sandy said:
You'd have to add a resistor network to attenuate the input gain. Its way too high when used with cd source.
Sorry, I can't recall the actual values as it was implemented successfully for a friend who complained that 3 clicks of the step attenuator (built in volume control) was already too loud.
exactly the same problem
Exactly the same issues....even first point of the attenuator is too loud !!
Exactly the same issues....even first point of the attenuator is too loud !!
My friends and I all built the Marantz M7 line amp as our reference for enjoying the music. We all using Tube Regulated Power Supply for B+ and stabilized 12Vdc for the filament supply.
The results are very remarkable and outstanding.
Besides, I also built another one using 12SL7 and 12J5 instead of the 12AX7 and 12AU7 for amplication and bugger. However, I need to tweak the bias for the 12SL7 to get good sound from it.
Johnny
The results are very remarkable and outstanding.
Besides, I also built another one using 12SL7 and 12J5 instead of the 12AX7 and 12AU7 for amplication and bugger. However, I need to tweak the bias for the 12SL7 to get good sound from it.
Johnny
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