[Duesentrieb]

Einige hat ich auch schon auf der Bank - wie da wer auf Keksdosen Dumble kommt, ist mir schleierhaft.
Zu den Reps kann ich nur sagen, dass man quasi mittlerweile das gesamte PCB checken muss, da die Qualität damals (leider) nicht an Marken wie Marshall etc. heranreicht (oder das hängende Gehäuse ist Schuld), ich musste jedenfalls quasi immer ne Menge nachlöten und wieder "ins Lot" bringen.

Klingen tun sie trotzdem gut. Ach ja, bei den Mehrkanalern mal einen Blick auf die Relais werfen, die versagen schon mal ganz gerne ihren Dienst . . .

[Mr. Lime]

Es geht ja schon länger das Gerücht um, dass Dumble Platinen verbaut wurden..
Der Junior ist ja auch keine 1:1 Kopie des Mesa Mark I.
Von den Kittys scheint es aber einen Haufen Prototypen zu geben!

Beim Standard Schaltplan stört mich aber immer noch, dass der Lead Volume Pot-Ausgang gegen Masse geht und keine Bahn zur V1b führt, oder wurde das einfach nicht eingezeichnet? Ein Kontenpunkt ist ja angedeutet..

[reverbus]

Hi guys,

here is mine (reversed eng.) schematic, maybe it'll be helpfull for somebody:

[Manfred]

Hi reverbus,

thanks a lot for sharing the schematic.

regards Manfred

[Mr. Lime]

Thank you!

Your schematics help a lot 


best regards

[Manfred]

Hi reverbus,

a attach the preamp schematic with marked area by a red circle.
There are two capacitors without values.
Being the values unreadable?

Thanks again for your efforts.

regards, Manfred

 

[reverbus]

Hi Manfred,

oh, I see, values are missing.
I'll take a look if I can find notes and will let you know.

Regards,
Iztok

[Manfred]

Hi Iztok,

thanks, I appreciate your work very much.

Regards,
Manfred

[reverbus]

The two capacitors are ceramic discs, see edited scan attached here:
(I can't swap attached scans in my first post. If moderator is able to do it, please)

[reverbus]

Additionaly, some photos before el.restoration:
http://www.mojalbum.com/bmw-sound/kitty-hawk-standard
http://www.mojalbum.com/bmw-sound
(photos are not sorted, whole "album" is my backup, waiting to launch website)

I'm sorry I can't join into disscusion in German language, you're great community.

Regards,
Iztok

[Robinrockt]

Additionaly, some photos before el.restoration:
http://www.mojalbum.com/bmw-sound/kitty-hawk-standard
http://www.mojalbum.com/bmw-sound
(photos are not sorted, whole "album" is my backup, waiting to launch website)

Hi Iztok,

thank you for the schematics and the amazing pics. Very much appreciated.

Regards,
Robin

[Manfred]

Hi Iztok,

thank you very much for adding the values.

In the original schematic V1a and V1b are constant current diodes applied for biasing,
in your schematic are 1,5kOhm resistors for each instead of both.
Did you substitute the constant current source diodes for resistors?

Regards,
Manfred

[reverbus]

Hi Manfred,

yes, there were diodes, as original design.
This, I agree, must be said, to have/keep accurate schematic of this KH Standard amp.
As far as I remember (2011), I was not able to read values, so I put bias resistors in there.

It wasn't my amp, a friend of mine gave it to me to do the job.
Later on, this Standard was sold to Germany somewhere.
It is very nice sounding combo, among the best I did play in this range.

A friend of mine still have 7 or 8 Kitty Hawks, but no Standard.
There are mostly Counterpoints, then also Junior (+Junior Pro), The Kid, modded Supreme, Quattro preamp...

I have Supreme II head (6xEl34), I kept original clean channel + I modded drive to Trainwreck Express.
It really is a beast, but needs some attention for fine tunning.

Regards,
Iztok

[reverbus]

Robinrockt & Mr.Lime,
you're welcome 

Hopefully it will help somebody, although care must be taken.
I did triplecheck everything during drawing but an error or mistake may be hidden somewhere.
It's always welcome if additional pair of eyes do take a look at.

Regards,
Iztok

[Manfred]

Hi Iztok,

the diodes were CR180 current regulator diodes, have a look at the attachment.
Never mind, the amp is away.
I got two Kittyhawks too, a Junior Series 1 and a Junior Pro.
Both are not working at the moment, I hope to fix each over the year.

Regards
Manfred