Realistic Stereo 24 - 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 29th December 2010, 03:58 AM   #1
diyAudio Member
 
Join Date: Dec 2010
Default Realistic Stereo 24

Hi - does anybody have any literature or info/opinions on this amp? I just bought one from ebay, it is my first foray into tubes, and although I know it is low power, I have often found, especially for vintage, that Realistic units are often way under rated. I am hoping this is the case here. I seek "great sound" (duh) at a lower investment than some of the stuff I've seen float around (yikes). I have a variety of quality and efficient, new or vintage speakers to use with the amp, and intend to have the unit thoroughly inspected/bring-to-spec by a local respected stereo guy.

But I'd like anyone else's thoughts...worth putting some bucks into? Good circuit design? Waste of time? A manual would be most welcome...!! Thanks folks...

Chad

Yamaha Cr-1020 and CR-2040
Realistic Nova 8Bs
Athena model somethings - very nice
Boston Acoustics Micro 90s and 90c - excellent for the money, they pair well with athenas and i've heard few speaker matchings that did as well
Integra 8.3 Receiver - solid performer, clean sound
Onkyo Integra TH-SV919 THX - sweet sound - heavy as hell
Bunch of other misc...but I do say my stuff holds its own with any similar power range...
  Reply With Quote
Old 29th December 2010, 05:33 AM   #2
diyAudio Member
 
Join Date: Apr 2004
Location: Monroe Township, NJ
Google doesn't turn up a schematic. However, it seems the unit employs the 6BQ5/EL84. Look inside and jot down the tube complement. Unless the O/P trafos are complete garbage (unlikely) the unit should be worth refurbishing. If you're very lucky, NICE Hashimotos are present and not refurbing is criminal.

Contact R/S to see if they can provide a schematic.
__________________
Eli D.
  Reply With Quote
Old 29th December 2010, 03:18 PM   #3
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
I had a Realistic Stereo 24A which sounded very good actually, and used 6BM8s in the output stages and a couple of 12AX7A in the phono section. No idea what happened to it. Lost sometime over the last 10yrs..

Based on more recent experience with a Realistic Stereodyne 40, JJ electrolytic caps might just slot neatly into the amp as replacement caps for the power supplies.

The coupling caps in these amps are good sounding, but incredibly leaky paper things that must be replaced if the amp is to be reliable.

Don't know who made the OPTs in these amps, but they are tiny - and perform way, way better than they should. Rumors abound that the cores are actually something special like permalloy. Can't really confirm, but the lams are very thin and there are a great many of them.

There are sams for all of these amplifiers.
__________________
"Extraordinary claims require extraordinary evidence." - Carl Sagan

Last edited by kevinkr; 29th December 2010 at 03:24 PM.
  Reply With Quote
Old 29th December 2010, 05:06 PM   #4
diyAudio Member
 
Join Date: Dec 2010
Default Thanks

Thanks for the replies, guys. I appreciate it. What's a "sam"? :-)

I will post more info once I get it and have a chance to inspect - should come home early next week.

I'll hope for the better transformers - the pictures, too me, seemed like some heavy iron, but I really have no good idea. My older Yamahas and an Onkyo have some serious iron in them, but of course they are geared for different duties.

More comments are welcome, especially from any current owners.

Cheers.
  Reply With Quote
Old 29th December 2010, 05:24 PM   #5
diyAudio Member
 
Join Date: Dec 2010
Thanks for all the replies - what is a "sams"?
  Reply With Quote
Old 29th December 2010, 10:18 PM   #6
diyAudio Member
 
Join Date: Dec 2010
Never mind - I figured it out. However, they (Sams) did not have a "Realistic Stereo 24" amplifier - I'll have to wait until it gets here to evaluate.

Cheers.
  Reply With Quote
Old 29th December 2010, 11:47 PM   #7
diyAudio Member
 
Join Date: Jun 2004
Location: Indiana
I await with interest. I have always been a fan of vintage 1970s Realistic sand but have no knowledge of their hollow state efforts.
__________________
If We The People refuse to hear the truth we will be ruled by liars.
  Reply With Quote
Old 30th December 2010, 12:34 AM   #8
diyAudio Member
 
Join Date: Apr 2004
Location: Monroe Township, NJ
Kevin's remarks lead me to believe that the R/S unit might be related to the Sansui 500. That receiver uses 6BM8 "finals" too and the paper in oil (PIO) coupling caps. employed are notorious for leaking. Those caps. should be replaced by Soviet surplus K40s.

When the unit arrives, definitely take a look and jot the tube complement down. Under no circumstances should the unit be plugged in. A variac is needed to slowly ramp the voltage applied up. The filter caps. need reforming, at a minimum, and rate to require replacement.
__________________
Eli D.
  Reply With Quote
Old 30th December 2010, 12:58 AM   #9
diyAudio Member
 
Join Date: Dec 2010
Thanks Eli, that is quite interesting. As I stated, I happen to think many items of Realistic vintage are a bit underrated...my local stereo tech is actually well versed on stereo matters. I will run your thoughts past him.

I actually considered Sansui 111 (I think that is the model)...I have high regard for much of Sansui older equipment - but the prices were more than I wished to devote. So I am hopeful the R/S piece is a "copy" or very good original design of contemporary items.

Anybody ever check out Radio Shack Catalogs ? The older catalogs show Realistic selling Mcintosh, Bogen, Lafayette, Scott and Stromberg-Carlson, among several others - surely they had to compete with those brands at some level, too.

Best regards and thanks for the input.
  Reply With Quote
Old 4th January 2011, 01:47 AM   #10
diyAudio Member
 
Join Date: Dec 2010
Well, I can't tell what transformers it has; nor much about the design. Of course, I am an industrial engineer, not electrical. It has a bias control on the back, I think - it is labeled "hum balance"...?

Still, it looks solid and quality, overall...thoughts? I am taking it to my tech guy for a good overhaul...the receiver below it is a 40/T I will revamp eventually.
Attached Images
File Type: jpg IMG00073-20110103-1959.jpg (380.4 KB, 292 views)
File Type: jpg IMG00076-20110103-2000.jpg (375.5 KB, 265 views)
File Type: jpg IMG00077-20110103-2002.jpg (356.8 KB, 252 views)
File Type: jpg IMG00080-20110103-2003.jpg (339.1 KB, 241 views)
File Type: jpg IMG00089-20110103-2013.jpg (511.0 KB, 236 views)
File Type: jpg IMG00092-20110103-2014.jpg (303.1 KB, 83 views)
File Type: jpg IMG00082-20110103-2004.jpg (355.9 KB, 72 views)
File Type: jpg IMG00083-20110103-2004.jpg (321.1 KB, 69 views)
File Type: jpg IMG00072-20110103-1958.jpg (422.9 KB, 81 views)
  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
Goldpoint. new, 10K, 24 step stereo attenuator franjy Swap Meet 2 29th May 2012 05:30 AM
24 steps ladder attenuator 50k stereo Gluca Group Buys 6 5th December 2010 03:30 AM
Stereo power amp, 24 volt supply johnr66 Chip Amps 4 4th January 2010 04:30 PM
Burning DVDs for 24/96 stereo playback Dartagnan Digital Source 6 14th July 2005 10:40 PM
AD1855 DAC 96kHz/24 bit stereo peranders Swap Meet 0 18th April 2002 08:40 AM


New To Site? Need Help?

All times are GMT. The time now is 12:11 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