[bce22]

Matt, that sure is a beautiful Sui Eight!
 
Wish I owned one as well (maybe some day).  On a sad note my Realistic STA-2100D took a nose dive the other day.  I heard a loud snap, crackle and pop and turned it off immediately but it wasn't soon enough. I haven't had a chance to open her up but it will definitely be repaired in short order.  
 
All the more reason to learn electronics and purchase the tools to repair this stuff.
 
When you play with unrestored vintage gear you are playing with ticking bombs!  Gotta be prepared for them to go off.

 

[Arsis]

Here's my Zenith MC7050. Made in 1979. I got it new in the box in 1985. My dad was Zenith dealer for close to 40 years. Sounds great! 40 wpc. I found a few people online who thought they were made by Sansui but I dunno...

 

[Meewoo]

@BCE22
 
Do you live in Amazon or Sahara? More than one hour drive to Fedex warehouse?

You can ask Fedex to drop package at their store nearby and pick up package there,
 
Oh, was your Realistics made by Pioneer? My SX-1250 experienced same problem in one channel. And this problem was discussed widely in AK, a transistor died or something. You can check AK and maybe you can fix it yourself.  I have my 1250 sit in closet and hope someday I can restore it myself. Haha, I am still dreaming...

 

[Trav]

Here's my Zenith MC7050. Made in 1979. I got it new in the box in 1985. My dad was Zenith dealer for close to 40 years. Sounds great! 40 wpc. I found a few people online who thought they were made by Sansui but I dunno...

Very cool!

 

[Trav]

Kyocera R 851 just went on EB for $128 and 30 something shipping...wow

 

[5aces]

Here's my Zenith MC7050. Made in 1979.

There's a first, thanks for a jog of memory to the way back machines...
My older sister had a 1976 all Zenith system for her bedroom.
Allegro 1000 speakers, stacking auto record player and receiver.

My first real television was a big TOTL 1980 console Zenith System III with remote, it was big bucks back then @ $1,200 Can.

 

[kstuart]

Alright, I will break the silence with my speakers... the same tweeter as on their $30,000 speakers, the same midrange as used in professional studio monitors (I can verify that from seeing them first hand), and a very advanced woofer for its time:
 

 

[wotts]

I just saw a pair of the Qa on my local craigslist. They look to be similar minus the smaller driver.

 

[kstuart]

  I just saw a pair of the Qa on my local craigslist. They look to be similar minus the smaller driver.

The Qa are not as good - the tweeter and the woofer are too far apart in their coverage - neither is particularly good at midrange.  In the "Infinitesimals" earlier in the thread, the woofer is a much smaller size, and so the midrange coverage is better... but then you need a subwoofer.

 

[analogsurviver]

  The Qa are not as good - the tweeter and the woofer are too far apart in their coverage - neither is particularly good at midrange.  In the "Infinitesimals" earlier in the thread, the woofer is a much smaller size, and so the midrange coverage is better... but then you need a subwoofer.

Qa and Qb are sort of "twins", Qa being a two way and Qb a three way speaker. I never heard a Qb, but a friend used to have Qa and I spent considerable time with them. I concur Qa is no midrange champ. But although I never did have a chance to hear the original Infinitesimals, I believe they must run rings around either Qa or Qb, subwoofer or no subwoofer added. Mini monitors project such spatial presentations big rectangular boxes simply can not match.
 
The best I ever heard an Infinity speaker sounding was Infinity Reference Standard 4.5 at audio fair in Milano, Italy, mamy full moons ago. The EMIM midrange is superiour to any cone type driver I am familiar with. Funny, the much larger and more expensive IRS  I heard at the same fair a couple of less full moons back never managed to produce the same grandeour as 4.5s - probably a function of the rooms used, 4.5 being in a comparatively too large room and IRS in too small room. IRS is basically 4.5 multiplied many times - same EMIM and EMIT drivers used, similar variation on Watkins woofers.

 

[jasonb]

So as I understand it, the Q701 isn't affected much at all by output impedance because it's impedance is near flat across the spectrum:

 
Now what happens if I upgrade to an HD800:

 
So, if my SX-750 an output impedance of 150 ohms, what will this do to an HD800?

 

[LugBug1]

  So as I understand it, the Q701 isn't affected much at all by output impedance because it's impedance is near flat across the spectrum:
 
 
Now what happens if I upgrade to an HD800:
 
 
So, if my SX-750 an output impedance of 150 ohms, what will this do to an HD800?

Trust me, they will sound a lot better than your Q701's and I'm a fan of the AKG's. 
 
The high impedance of these old amps add weight to the bottom end of the sensitive Sennheisers. Some like it, some don't. I think they really benefit from it. 

 

[Meewoo]

Mint Sansui AU-20000 on ePay http://www.ebay.com/itm/sansui-power-amplifier-AU20000-/271272554109?pt=Vintage_Electronics_R2&hash=item3f291aae7d
 
@5aces, how much would you pay for this piece?

 

[jasonb]

  Trust me, they will sound a lot better than your Q701's and I'm a fan of the AKG's. 
 
The high impedance of these old amps add weight to the bottom end of the sensitive Sennheisers. Some like it, some don't. I think they really benefit from it. 

 
hmmmm... That sounds good, I just wish I knew the science behind it. 

 

[Oregonian]

Another good find..................$20 at a garage sale.  Neighbor said his kid left them behind after he moved out.  Glad I have buddies out keeping their eyes open for me.    These are the DX-3's with 10" drivers.
 
Sound mighty nice - very efficient speaker as CV's are known to be.