Marantz 7C still good today? - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 15th November 2005, 06:20 PM   #1
diyAudio Member
 
Join Date: Sep 2003
Location: New Jersey
Default Marantz 7C still good today?

With so many morden design of pre-amp, is Marantz 7C still a good pre-amp to do diy?

Does it also make sense to make it into balanced mode (as I am using Aleph 5 that can take both unbalanced balanced mode)?

Many thanks,
  Reply With Quote
Old 15th November 2005, 06:44 PM   #2
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
A wise man once observed, "There are no classic preamps."

He was right.
__________________
You might be screaming "No, no, no" and all they hear is "Who wants cake?" Let me tell you something: They all do. They all want cake.- Wilford Brimley
  Reply With Quote
Old 15th November 2005, 07:12 PM   #3
diyAudio Member
 
tomtt's Avatar
 
Join Date: Aug 2002
Location: kansas city mo, and on occasion, around the world ...
Blog Entries: 15
Default Re: Marantz 7C still good today?

Originally posted by tomchaoda
With so many morden design of pre-amp, is Marantz 7C still a good pre-amp to do diy?

Does it also make sense to make it into balanced mode (as I am using Aleph 5 that can take both unbalanced balanced mode)?

Many thanks,

```````````````````````````````````````````````

system interaction,and your ears,should be the ultimate

judge, the parts can always be used for other projects.

an actual 7c will be so vauable, stock,any mod will result

in monitary loss
  Reply With Quote
Old 15th November 2005, 09:28 PM   #4
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
I am with SY on this one, I have never heard a vintage pre-amplifier that sounded good by today's standards. Also building a balanced version makes it something else altogether.

Balanced output does make sense with the Aleph, so how about a transformer coupled line stage with balanced output and a 27, 56 or similar as the amplifier tube. Most sources are single ended so I would not necessarily bother with balanced internal topology or inputs.

I would also recommend a stepped attenuator instead of a pot.

There are lots of articles on the web for this sort of thing.

I wrote an article on a 26dht based transformer coupled pre-amplifier for Positive Feedback online a few months back. You might want to check it out.. (Or not..)

I once owned a 7C and found the sound relatively inoffensive, but veiled compared to some other more modern designs.

Kevin
  Reply With Quote
Old 16th November 2005, 01:13 PM   #5
kmtang is offline kmtang  Canada
diyAudio Member
 
kmtang's Avatar
 
Join Date: Nov 2004
Location: Vancouver
I have just built a Marantz 7C clone line amp. I changed the output tube from 12AX7 to 12AU7.

I found it sounds really good to me. I just love it.

Johnny
  Reply With Quote
Old 17th November 2005, 03:10 AM   #6
TJ is offline TJ
diyAudio Member
 
Join Date: Sep 2001
Location: UK
i found the classic M7 sound 2 old (slow) for my taste !! did anyone encounter this problem ?
  Reply With Quote
Old 17th November 2005, 03:23 AM   #7
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
Yes, amongst other things.. I think it is about the best of the lot, but that ain't saying much, unlike tube power amplifiers which achieved really high levels of performance long ago no vintage pre-amplifier even seems to come close to what is possible.

One pre-amplifier that seems to be more of an exception to this rule is the old Citation IV, but it is very sensitive to tube quality/condition. It was more transparent than anything else I tried.

Kevin
  Reply With Quote
Old 17th November 2005, 06:33 AM   #8
kmtang is offline kmtang  Canada
diyAudio Member
 
kmtang's Avatar
 
Join Date: Nov 2004
Location: Vancouver
The M7C I built is with all the good components - Riken resistors, Jebsen copper-in-oil coupling caps, and Mundorf tubecap for B+ bypass. It just sounds great to me. Smooth as silk and powerful as a horse. Its soundstage is much wider and deeper.


Johnny
  Reply With Quote
Old 29th December 2013, 09:02 PM   #9
diyAudio Member
 
denny9167's Avatar
 
Join Date: Nov 2007
Location: Graham, TX
Quote:
Originally Posted by kmtang View Post
I have just built a Marantz 7C clone line amp. I changed the output tube from 12AX7 to 12AU7.

I found it sounds really good to me. I just love it.

Johnny
I can agree with you on this one, I sub-ed a 12ax7 for a 12au7 in the output of a
Dynaco FM-3 it made a huge difference in the sound. It may not always work that way, it just depends on curcuit parameters.
  Reply With Quote
Old 29th December 2013, 09:07 PM   #10
diyAudio Member
 
denny9167's Avatar
 
Join Date: Nov 2007
Location: Graham, TX
I just recently purchased a spice program and thought I would do a little tinkering with the Marantz 7 phono stage, I sub-ed the cathode follower with a 12au7 just to see what the results would be. I did some sweeps on the design and realized that I needed a grid stopper to couple the output to the 12au7, the results look pretty good so far. I'll have to play with the feedback network a little bit to come up with a good response.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Let's see, what did we DIY today? Magura Parts 7 5th June 2009 07:46 AM
Old Pioneer amps.quality as good as today? fazman Solid State 30 26th November 2006 05:07 PM
New Marantz CD players - good base for non os solutions ergo Digital Source 0 18th June 2004 05:57 AM
Do a good dead and help a newby today Linear_DC Parts 5 17th February 2004 12:38 PM


New To Site? Need Help?

All times are GMT. The time now is 07:51 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2