Repairing The Venerable Crown DC 300

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
 
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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..........
 
And I just can't send out a care package withpout a few surprises.
 
Well now..............5'10"" , blond, kinky, with a F&^% Me attitude??
 
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...
 
Hmmmmm...... I'd rather it be in the convenient "user friendly" single pack.
 
Ok, if you bill for some of this stuff send me some , but if it's for your stuff.......
 
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.
 
Mark
I will look after my leaf blowing session today. Good weather and gotta use the daylight.
 
We have those every day Joe. 24 hours a day. We get the neighbors, the neighbors get ours, etc....
 
mlucitt said:
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.
Click to expand...

I have a lot of oddball stuff to Mark. I get a minute I'll look through some.
 
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
 
Mark
Do you need to replace the originals or just desire to do so? The context helps me.
 
Mark do you have the service manual and parts list for the amp?
 
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.
 
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.
 
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