Lytic Selection Help - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 23rd May 2005, 05:54 PM   #1
diyAudio Member
 
Join Date: Apr 2004
Location: Alabama
Default Lytic Selection Help

Hi all...

I have a Marantz Model 25 integrated receiver that I want to have updated. I am bidding on a service manual at the moment, but in the meantime I would like to go ahead and purchase some new Lytics for it. I am not a DIYer per se - and will have someone do the work on it, but I would like to chose the replacement parts myself. I really enjoy reading about and learning about what components/parts are used in them.

The lytics in them are Nippon Chem 4700uf/50v. They appear to be ran parallel? Not sure what you call it, but they are wired together and shunted with resistors. They also appear to have bypass caps on the tag-board that the + attaches to (CPM .01uf/250v).

I think this amp uses Mos-Fet output - but I am not positive. I am looking to have it sound as tubesque as possible - I like very clear midrange with a solid bass, but do not like extremely bright highs - if that makes any sense. Any suggestions as to a good quality lytic to replace the Nippon, is greatly acepted.

"After acquiring the company, Superscope’s President Joseph Tushinsky aimed to expand the business and make Marantz a more general audio manufacturer. He looked to Japanese manufacturers to help him move into the mid-segment, and a trial production run with the Standard Radio Corporation of Japan led to the Model 25 modular stereo in 1966, joined later by lower cost models 22 and 28. Around this time, design and production (except for A-line articles) was switched from the US to Japan, and Superscope took a 50% participation in Standard Radio Corp. This corporation changed its name to Marantz Japan Inc. in 1975."

Cheers...
Nate
Attached Images
File Type: jpg model25_lytics.jpg (94.7 KB, 212 views)
  Reply With Quote
Old 23rd May 2005, 07:32 PM   #2
diyAudio Member
 
Join Date: Apr 2004
Location: Alabama
I looked round inside and find it uses 4) Mos-Fet's on the output. 2) Motorola SJ2008 and 2) Motorola SJ2009

It also has 4) each Toshiba 2SA497 and Toshiba 2SC497 transistors.

Cheers...
  Reply With Quote
Old 24th May 2005, 02:03 AM   #3
anatech is offline anatech  Canada
diyAudio Moderator
 
anatech's Avatar
 
Join Date: Jun 2004
Location: Georgetown, On
Hi bamadawg,
To the best of my knowledge, no one used mosfets in 1966. All the Marantz designs I am familiar with are bipolar or tube. Some new ones may be an exception.

If you are having the unit rebuilt, have the service guys choose and acquire your parts for you. Really. If they aren't to be trusted with that, you can't trust them to work on the unit to begin with. They will know what parts are suitable for this design.

This unit will never sound tube like. It's solid state. It will sound Marantz 25 like. It may sound nice when it's done but transistor design was not nearly as advanced as it is now. The transistors themselves have improved greatly on top of that. They did the best they could back then. Marantz design was generally at or near the head of the pack, they were ahead of their time. The SJ numbers are house numbers from Motorola. They will not tell you what they are as a base part #. The records may be gone by now.

-Chris
  Reply With Quote
Old 24th May 2005, 09:50 AM   #4
diyAudio Member
 
EchoWars's Avatar
 
Join Date: Dec 2002
Location: Left of the Dial
What you've got, bamadawg, is a really old but really nice SS amp that has a fair bit of history attached to it. It certainly ain't never gonna sound 'tube-like' unless you rip out the guts and replace 'em with a Dynaco 70.

RE: MOSFETS...1966 was about 12 - 14 years before power MOSFETS came into any real use. Certainly in '66 they were only an idea that was looking for a way to be reliably produced.
  Reply With Quote
Old 24th May 2005, 06:40 PM   #5
diyAudio Member
 
Join Date: Apr 2004
Location: Alabama
A few more pics...

I have no idea when Mos-Fet were introduced. I have them in my Marantz 2226B, and they are mounted on a heatsink like these are.

I know SS will never sound like a tube amp, I own those also. Jus that Mos-Fet powered are suppose to sound more "warm" like a tube amp. I have read of people using Vitamin Q caps in SS amps/receivers - I guess to further give it a "warm" sound.

Cheers...
Nate
Attached Images
File Type: jpg model25_mosfet.jpg (99.1 KB, 128 views)
  Reply With Quote
Old 24th May 2005, 06:43 PM   #6
diyAudio Member
 
Join Date: Apr 2004
Location: Alabama
Nuther pic...
Attached Images
File Type: jpg model25_inside.jpg (99.6 KB, 123 views)
  Reply With Quote
Old 24th May 2005, 10:01 PM   #7
diyAudio Member
 
EchoWars's Avatar
 
Join Date: Dec 2002
Location: Left of the Dial
Quote:
I have them in my Marantz 2226B
Nope...those are plain ol' bipolar transistors.
  Reply With Quote
Old 24th May 2005, 11:35 PM   #8
anatech is offline anatech  Canada
diyAudio Moderator
 
anatech's Avatar
 
Join Date: Jun 2004
Location: Georgetown, On
Uh huh,
Bipolars. But bipolars can sound great , or bad depending on the circuit. I wouldn't get completely worked up about cap types. Just plain new works well. And of course, they must fit properly. Installing components that are too large is a sure way to ruin a unit.

-Chris
  Reply With Quote
Old 25th May 2005, 01:45 AM   #9
diyAudio Member
 
Join Date: Apr 2004
Location: Alabama
Thanks guyz...

I think I will get some Philips LL lytics that are available for the time being and will study the scheme's when I get the Service Manual.
  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
Mundorf M-Lytic and Silver-in-Oil Capacitors kmtang Tubes / Valves 19 4th January 2011 06:58 AM
Does anyone knows these lytic's brand? Akira386 Parts 2 9th February 2007 08:20 PM
'lytic and PSUd question Zen Mod Pass Labs 6 3rd March 2006 05:43 PM
Sub selection marcus555dc Subwoofers 5 14th February 2006 03:52 AM
Pre-amp selection Joe04 Tubes / Valves 1 24th February 2004 11:09 PM


New To Site? Need Help?

All times are GMT. The time now is 08:45 PM.


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