• The move to the new server is done. There are some software and database maintenance updates in process. This has us passing the hat around to help out. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html

7T & 3300 audition

jstang

jstang

Honey,I can't hear you...
Today I repaired my 3300... bad transistor in the power supply.

Did a side by side audition with the 7T....

I am sticking with the 7T, it sounds more precise and more balance through out the frequency range.... also seems to provide more harmonics in the mid ranges.

The 3300 was close but the 7T called my name.....

Also found this thread....

http://audiokarma.org/forums/showthread.php?t=23388


johnk
 
Register to hide this ad
Yes - the 7T is definately a great pre. In the meantime - since my comparison with the classic pre's from Marantz, I got my self a 7 (tubed). In the near future I'll compare the 7T with the 7. They'll probably sound different, but it is exciting to me what the differences are.

regards
Freddy
 
Freddy, What serial number 7T do you have? Another AKer mentioned that there are some differences in the early and later 7Ts. And that the early 7T are thought to sound the closest to the 7C.

Mine is a pretty low serial number 10430, which would be 430th. It was purchased in 1966.

Would be very interested in a 7T to 7C comparison. I might consider a 7C for next years upgrades....


jk
 
My 7T is #17445 (Woodside). It has a sticker tied on the powercord mentioning february '67.
My friend has got a 7T (unknown serial #). It has quite different capacitors all over inside. Many of them er red in colour.

Regards
Freddy
 
fredmarantz said:
My 7T is #17445 (Woodside). It has a sticker tied on the powercord mentioning february '67.
My friend has got a 7T (unknown serial #). It has quite different capacitors all over inside. Many of them er red in colour.

Regards
Freddy
Click to expand...

KRELL uses them also~!.
i really would recommend replacing them.

frako: alway gold film! or very old ones without film. Bad components.
revox/studer uses them very mush.
 
these are frako caps.

NOT red.

Bild2688.jpg


these usually measure fine, but they are absolutely not fine at all.! :thumbsdn:
 
The 7t have very few electrolytics. I replaced 4 or 6 of them....I forget. But the main signal path has only 4, I think....

jk
 
Can't turn mine off right now.....:D

This is from classic-audio.com.

bt_0007t.jpg



One below is from an Ebay add.....
 

Attachments

  • cf67_3.JPG
    cf67_3.JPG
    81.7 KB · Views: 74
Get serious - you flying Dutchmen!! (he-he)
I'll try to bring up a couple o' pics - showing the goodies in my 7T and my friends 7T. They are quite different, but both look very original inside- be patient .

regards
Freddy
 
Be patient.... NO:no:..... Post those pics....we need to see.....:yes:

jk


fredmarantz said:
Get serious - you flying Dutchmen!! (he-he)
I'll try to bring up a couple o' pics - showing the goodies in my 7T and my friends 7T. They are quite different, but both look very original inside- be patient .

regards
Freddy
Click to expand...
 
No PC boards... and P to P on insulated studs. Transistors are in sockets....

Very tube like construction, the tone controls are stepped switches with discrete caps & resistors just like the 7C.

SB Marantz said:
Very nice!
P to P wiring.
Click to expand...
 
Compared to the 3xxx series and 33, I prefer the 7T. Not that the others are bad but just that Maraantz did not have the magic touch to design and make as great preamp as they did earlier.
 
I think the keys are the...

Steel plates that are used to mount the components VIA insulated posts. That provides a ground plane for every single point to point wiring run. That reduces the self inductance of a run.

Secondly the stepped tone controls with ploy caps...

Third they matched all the transistors, not sure they did that on the later pre-amps.

Fourth...last that I can see.... Single rail rail power supply. The 3300 is dual rail..... Dual and single each have their own reasons to be used....

I found a URL on how to hop up a 7t.... will post it....see what u guys think....

http://www.diyaudio.com/forums/showthread/t-113826.html

jk
 
jstang said:
I think the keys are the...

Steel plates that are used to mount the components VIA insulated posts. That provides a ground plane for every single point to point wiring run. That reduces the self inductance of a run.

Secondly the stepped tone controls with ploy caps...

Third they matched all the transistors, not sure they did that on the later pre-amps.

Fourth...last that I can see.... Single rail rail power supply. The 3300 is dual rail..... Dual and single each have their own reasons to be used....

I found a URL on how to hop up a 7t.... will post it....see what u guys think....

http://www.diyaudio.com/forums/showthread/t-113826.html

jk
Click to expand...

From reading this post, this Marantz tech [MOER] sounds very good.
LINK:
http://www.diyaudio.com/forums/showthread/t-113826.html
Thanks for posting this.

Personally, I'm loving my 'upgraded' 7T. Absolutely Marantz's best preamp, IMHO.
O.K.... the 7 & 7C are great... a matter of taste I guess;
but then there's the added harmonic detail in the bass and high frequencies, and the expanded soundstage in the 7T.
The 7C is glorious in the mid-range, though... vocals, strings, horns... you got to love it.

So which is our favorite???:scratch2:
 
Last edited:
You must log in or register to reply here.
Back
Top Bottom