Repairing The Venerable Crown DC 300

[mlucitt]

Sheesh, you are a one man swap meet. Just one set of the bolts/nuts (4) and a pair of each flavor of those caps for the PL400 and PL700 would keep me going for awhile. The meter replaces one that was burnt and I tried to fix it but those wires are very small. And I'm sending payPal so tell those bull gears to stop turning for a moment.
Mark Lucitt
2604 Alvey Drive
Haymarket, VA 20169-1204

 

[laatsch55]

Evidently, you and I have an altogether different idea about why those gears turn in the first place........ And PayPal won't credit my acct if I don't claim it..........

 

[laatsch55]

And I just can't send out a care package withpout a few surprises.

 

[mlucitt]

I understand bull when I hear it. I have some goodies I can send you if you would prefer...

 

[laatsch55]

Well now..............5'10"" , blond, kinky, with a F&^% Me attitude??

 

[mlucitt]

That is a rare creature, I've heard about them but never seen a live one. How about I send you four of them and each one only has one of those attributes describe above...

 

[laatsch55]

Hmmmmm...... I'd rather it be in the convenient "user friendly" single pack.

 

[laatsch55]

Ok, if you bill for some of this stuff send me some , but if it's for your stuff.......

 

[mlucitt]

My stuff. If it ever goes on ebay, I send your cut.

 

[laatsch55]

We have us a deal.

 

[mlucitt]

Joe, I am striking out (more than usual) on good substitutes for the vintage Crown DC300 series amplifier semiconductors. Here is my current list (help!):
DC300
Desig# - Device - Substitute
Q101 - TD101 - ?
Q102 - 2N3839A - MPSA06
Q103 - 2N5383 - 2N3906
Q106 - 40327 - 2N3439 positive pre-driver
Q114 - SS7304 or 2N4929 - ? negative pre-driver
CR101 - MZ2361 - ?
CR105 - 1N270 - ? (Germanium)
CR106 - MR2360 - ?
Q1 - MHT7698 - ? driver
Q2 - 2N3773 - MJ15024 (although the 2N3773 is stocked at Mouser)

DC300A
Desig# - Device - Substitute
Q103 - 2N4125 - 2N4125TF
Q104 - 2N6175 - ?
Q109 - 2N5804 - ?
D3 - 1N961B - 1N5240B 10V .5 W Zener
IC1 - uA739 or uA749 - ?

I could call the good folks at Crown (Harmon) but I thought I would check with you instead.

 

[Gepetto]

Mark
I will look after my leaf blowing session today. Good weather and gotta use the daylight.

 

[laatsch55]

We have those every day Joe. 24 hours a day. We get the neighbors, the neighbors get ours, etc....

 

[laatsch55]

Joe, I am striking out (more than usual) on good substitutes for the vintage Crown DC300 series amplifier semiconductors. Here is my current list (help!):
DC300
Desig# - Device - Substitute
Q101 - TD101 - ?
Q102 - 2N3839A - MPSA06
Q103 - 2N5383 - 2N3906
Q106 - 40327 - 2N3439 positive pre-driver
Q114 - SS7304 or 2N4929 - ? negative pre-driver
CR101 - MZ2361 - ?
CR105 - 1N270 - ? (Germanium)
CR106 - MR2360 - ?
Q1 - MHT7698 - ? driver
Q2 - 2N3773 - MJ15024 (although the 2N3773 is stocked at Mouser)

DC300A
Desig# - Device - Substitute
Q103 - 2N4125 - 2N4125TF
Q104 - 2N6175 - ?
Q109 - 2N5804 - ?
D3 - 1N961B - 1N5240B 10V .5 W Zener
IC1 - uA739 or uA749 - ?

I could call the good folks at Crown (Harmon) but I thought I would check with you instead.

I have a lot of oddball stuff to Mark. I get a minute I'll look through some.

 

[mlucitt]

I just climbed down from the roof myself. I completely understand people's schedules, I wish sometimes I had one of my own. Anyway, I appreciate the help anytime it comes. At this time, I think I'll have a beer.

BTW, after we're done it will be good to have this information on the site.

Mark

 

[Gepetto]

Mark
Do you need to replace the originals or just desire to do so? The context helps me.

 

[Gepetto]

Mark do you have the service manual and parts list for the amp?

 

[mlucitt]

I'm trying to place an order at Mouser, Allied, Digikey, etc. to have the parts on hand when I tear into the amp. I am OK with replacing the originals with better or more robust devices as long as the topology is the same. I will not replace any parts unless I need to or there is a safety factor. I'd kinda like to retain the sound quality of the amp if possible. After all, if I wanted a Sunfire, I would just buy a Sunfire (yeah, right).

I realize the double transistors and double diodes may have to be single devices now. I do have the parts list and service manual for both of the Crown DC300 amps. Not the Series II.

 

[mlucitt]

Joe, were you asking for a copy of the manual? Sorry, I only have it hardcopy if you were. I just found it here:

http://www.crownaudio.com/legacamp.htm

under "D Series"

Mark

 

[Gepetto]

Hi Mark
I have the complete set of manuals for Crown (one of them is an original), was asking because I did not know if you had them.