orion hcca 250r schematics

[ernie cosillos]

i have this orion hcca 250r that has about 12 fried transistors. i got this amp off a friend as a project and was hoping anyone out there can get me a schematic i need the transistor numbers and also if anyone has a 250r for parts i'd be willing to buy it off you. i need the braces that hold the transistors against the heatsink. i'd appreciate any help, thanks

 

[Perry Babin]

Are the transistors missing?

 

[ernie cosillos]

250r schematics

yeah the transistors are in fact missing, thankyou for responding. i'm really into old school amplifiers and i'd really hate to see this one go to waste

 

[Perry Babin]

Which ones are missing?

 

[ernie cosillos]

250r schematics

hey there! theres about eight from one side and four from the other. can't give you any specifics as to wich exact ones are missing, i'm kinda new at this stuff so i apologize for the lack of knowledge. all i can tell you is that they aretowards the center of the amp.

 

[Perry Babin]

There's a circuit board designation (Qxx) next to each transistor.

 

[ernie cosillos]

i will look up the designated numbers and will have them for you tomorrow regarding the transistor placement, and also in your opinion, is this model amp worth the trouble considering all thats wrong with it is the transistors, basically what happened to the amp was that the power wires accidently touched to the ground wire

 

[Perry Babin]

The lack of clamps would be the biggest concern for this amp. It's likely that you won't be able to find any. You may be able to make clamps for the transistors but to do it properly may be very time consuming.

 

[ernie cosillos]

YES THE LACK OF CLAMPS IS A MAJOR CONCERN OF MINE BUT SINCE I HAVE NO WAY OF OBTAINING THE ORIGINALS I'M FORCED TO CONSTRUCT MY OWN. ONCE I HAVE THE TRANSISTOR INFO THAT YOU WERE ASKING ABOUT IS IT POSSIBLE YOU WOULD HAVE THE NUMBERS?

 

[Perry Babin]

Yes.

How thick is the metal just behind the transistors (look at the end of the heatsink)?

 

[ernie cosillos]

I'D SAY A QUARTER INCH OR SO MORE OR LESS

 

[ernie cosillos]

I'D SAY THE METAL IS MORE OR A LITTLE LESS THAN A QUARTER OF AN INCH

 

[Perry Babin]

That's thick enough to drill and tap.

 

[ernie cosillos]

EXACTLY! I WAS THINKING THE SAME. I HAVE QUITE A BIT OF AMPLIFIERS I COULD TAKE THE BRACES FROM.

 

[Perry Babin]

If you think the amp is worth the effort, lay out the drill pattern on a piece of 3/8"x3/4" aluminum stock. Center-punch and drill all of the holes. Clamp the drilled aluminum stock to the heatsink and run the drill into the holes to mark the center of the holes on the sink. Remove the clamp. Then drill and tap the heatsink. #6-32 screws will probably be the best choice. For the holes in the clamp, a 9/64" drill is what I'd use. For the sink, you'll have to use whatever's suggested for the #6 tap.

 

[ernie cosillos]

I NEVER REALLY HAD AN ORION AMP. I'VE ALWAYS WANDERED OF THERE POWER. SO I'M HOPING IT IS WORTH THE EFFORT. WILL GET YOU THOSE NUMBERS T'MORROW MORN . THANKS

 

[ernie cosillos]

ok i have the transistor qxx numbers: q32,q28,q75,q76,q22,q18,and on the opposite side q33,q61,q62,q63. I really appreciate your help! THANK YOU!!!

 

[ernie cosillos]

I RECENTLY POSTED THE QXX NUMBERS FOR THE ORION AMP

 

[Perry Babin]

q32 2N6491
q28 2N6491
q75 2N6491
q76 2N6491
q22 2N6488
q18 2N6488

q33 NDP7060
q61 NDP7060
q62 NDP7060
q63 NDP7060

All 10 output transistors in the channel with the 6488s and 6491s you listed must be replaced. ALL of the NDP7060s must be replaced.

 

[ernie cosillos]

SO ALL OF THE TRANSISTORS I HAVE LISTED NEED TO BE REPLACED CORRECT? MUST I ALSO REPLACE ALL THE TRANSISTORS THAT ARE ALSO NUMBERED 6488-6491 AND JUST THE 4 NDP7060?