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LS7B Marantz 7 Clone PreAmp
LS7B Marantz 7 Clone PreAmp
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Old 12th February 2016, 05:48 PM   #1
HendryDM is offline HendryDM
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Default LS7B Marantz 7 Clone PreAmp

Hi Folks,

I'm a newbie in tube audio. A friend of mine gave me a modul kit (assembled) of
LS7B PreAmp Tube Marantz 7 Clone.

After I read some threads, I know some of you would say that this PCB/Kit is a "junk" but since I spent no money for it I think I should try it.
I plan to to finish assemblying it as I already all necessary parts but I need some knowledge on how to complete the PreAmp.

1. How do I set the B+ of this PreAmp? Should I do it by turn the VR1 (20 Kohm)?
2. If I should so, should I put all the tubes in place?
3. What is the best value of B+ for it?
(I use 2×EHG12AX7, 1×EHG12AU7 and 2×JAN5687).

Thanks and appreciate any advise from you guys, the tube masters!
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Old 12th February 2016, 09:27 PM   #2
BinaryMike is online now BinaryMike  United States
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Here's the original 7C power supply section, with DC output voltages annotated.
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File Type: png Marantz7Cpsu.png (151.7 KB, 180 views)
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Old 13th February 2016, 10:24 AM   #3
HendryDM is offline HendryDM
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Thanks BinaryMike.
You've just added my schematic library specially for Marantz 7.
Appreciate your info, but the kit has PS section integrated with signal section in single board.
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Old 16th February 2016, 02:32 AM   #4
BinaryMike is online now BinaryMike  United States
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Suggest you post the schematic and any additional information you have. With this stuff on display, you're likely to get more and better advice.
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