Hartke HA4000

[bobbybunante]

Hello,
I have a Hartke HA4000 bass amp. On the rear of the head there are a series of sends and returns. These are all in one circuit board together. The model number of the send/return board is 4005188605. Does anyone have an idea where I can get a replacement board for this amp? The actual jack housings are disintegrating. I fugure I either need a whole new board (preferable) or I need new jacks that I can solder into the existing board. The board has 5 plugs in it, one 2 pin plug at either end and three 3 pin plugs located intermediately on the board. Could shoot a pic and send if anyone needs it.
Thanks for your help.
Bobb

[Enzo]

No one will have that board, in the repair trade we fix such things. SOldering new jacks onto a board is basic work.

A picture would help identify the make and model jack.

[bobbybunante]

There are eight jacks total but three different model numbers.
The top of each jack is stamped with a CH2 with a circle around it I am guessing this is the manufacturers logo.
There are six jacks mod#JK504, one mod# JK507 and one mod# JK508.
The 504's have three solder pins
The 507 has six pins
The 508 has four pins
Is this enough info?

[bobbybunante]

BTW, Thanks Enzo for your help

[Enzo]

Prefer a photo if possible.

[bobbybunante]

Ok I looked at it all wrong. All of the jacks are identical. The one with 5 pins has a grounding strap soldered over the top of it. They all have 4 pins.
Not sure what I was looking at before. I got pics, they are attached at the bottom.

[bobbybunante]

MAy I ask what could be construed as a stupid question?
Is it possible to replace these with case mounted metal jacks that are connected with whips down to the circuit board instead of using the same plastic sockets? Would that work, or is that idea unfeasable? My thinking is only that metal jacks won't disintigrate again. But then would they cause an issue by being in contact with the case?

[Enzo]

They are plastic to isolate them from the chassis ground, you don't want to use metal bushing jacks.

Plastic jacks are sturdy enough, just exercise a little caution using the amp. Jacks get broken when you step on a cord plugged into it, when the amp is shoved into something with a plug in the jack, something tugging on the cords, etc.

I'd rather have a broken jack than a snapped circuit board or a bent panel.

Ah, I call those Jalco jacks, Jalco being one brand of them.

JK502, JK508 are just the jack numbers in the circuit - jack 502, jack 508. Just like resistor numbers R102, R108.

Looking at the photo of the underside, the solder side, I cannot quite see, but how many of them have the pin number 3 not really connected to anything? For example, the jack by your thumb, see how pin #3 is soldered to the board, but no copper trace leaves it for elsewhere. So it really is not connected.

The standard three leg ones will work there, I might be able to help on those. If all four legs are needed, then we'll have to find them. I don't know what Samson gets for the jacks, but you can always order them from a Samson/Hartke dealer. I don't know if Samson will sell parts direct or not.

[bobbybunante]

Ok I took a closer look. None of the jacks utilize the number 3 pin and only three of them use the number 4 pin.
Been a very long time since I have dealt with any of this stuff so I was definitely in need of a refresher course.
I have never done any of this professionally just took a HS electronics course in industrial arts 20 years ago. Haven't really done much of this since. I can handle the resoldering. I would have rather unplugged one board and plugged a new one back in but since that's not gonna happen, this is better than being unfixable by far.
Thanks for your help, I really appreciate it.
BTW how far are you from Chicago?
I went to the Jalco elec web site and found three jacks there. One definitely carries the same appearance but I couldn't view the pin configuration. Where would I see a belly view to know if the pins are in the same location.
Pleae don't laugh at me too loudly, but is this an item I could get through a place like radio shack. If so, I'd take the board there with me and have them secure the correct parts for me.

[Enzo]

Says Lansing Michigan under my name, so I am a couple hundred miles away or thereabouts. If I stand on my roof, on a clear day I STILL cannot see the Sears Tower.

Radio Shack will not have these. I have some that would work. I think Mouser does as well. Lemme look.

Mouser, these should work fine:

http://www.mouser.com/catalog/specsheets/KC-300156.pdf

16PJ500 is also Mousers stock number

[bobbybunante]

Thank You my new best friend. After I get them installed, I'll get back and let you know how they work.

[drewl]

I just replaced a couple of those this week.....they may be rigid, but they break ALL THE TIME...think about the idiot musicians/burnouts/stoners who use this stuff.......the mouser replacements are fine, I've also found suitable replacements scavenged from dead keyboards.

[bobbybunante]

I've actually found the whole I/O board from a repair shop that scavenged it from an amp that went bad. Had to pay a little for it, but it is supposed to be perfect. Will still replace the broken jacks in the old board for a spare just in case. The new parts for the board I have were going to cost me more than the replacement board cost.
I suppose I am lucky.
I am still looking for someone to repair my Fender Dual Showman tube amp. I'm in the Chitown area if anyone is willing to tackle this, e-mail me at bob-s-music@comcast.net and I'll explain what it is doing and what has been done already.

[bobbybunante]

Hartke HA 4000

Ok, Thank You to everyone who offered help. Thank You enzo for finding the jacks I needed.
I contacted Samson which owns Hartke about the board and parts before getting on here. It took time for them to get back to me. When they did, they said they had a returned amp in the back that they would scavenge the send / return board I needed from. They charged me $25.00 for the board and shipping. I thought that was a fair price. The board finally came last week. It is not a scavenged board from an old amp. They actually made a brand new board and sent it to me. I had to snap the extensions off of the board in order to install it. So, for $25.00 the manufacturer made a brand new board and sent it to me.
Now, I am going to fix the original board for the sake of experience.