Zen V9 J-fet poweramp finished.

[veteran]

I'm impressed Steenoe . Complete amplifier in just few days.

 

[Rodeodave]

Yess, nice and clean.

And those heatsinks look swell. Are they getting hot?

 

[steenoe]

Complete amplifier in just few days.

The ZenV9 was in the planning for a while, so Most of the chassis was done at the time you posted the board layout Thanks again. I had all the parts on hand allready so it was just a matter of putting it together. No sweat

And those heatsinks look swell. Are they getting hot?

I was concerned about the vertical fins, but wanted to try them for the cosmetic impression. They do get hot, but so did every Zen I made, even the Zen8-9 mix with the big big heatsinks
was getting really warm after a couple hours. This new ZenV9 is thermally stable, but I wouldnt like to use smaller heatsinks.
BTW, I was lucky to get those heatsink at work. They were sitting in a powersupply for some welding gear, that was thrown out.
I have 4 more, a little smaller, that would be perfect for a pair of Aleph-J monoblocks You know, Choky's Babbelfish

Steen

 

[rfj5106]

Heat Sinks

Congratulations on completing such a beautiful amp. The workmanship is astounding. You have already commented that the heat sinks get warm. Do you know the rating for power dissapation for the heat sinks you used?

 

[steenoe]

Do you know the rating for power dissapation for the heat sinks you used?

Thanks Richard. No, unfortunately I dont have the rating. I wouldnt use anything smaller than those on the pics, as they do get hot. After the above posts on the subject, I set out to monitor the temperature on the sinks. After more than 3 hours being turned on, the temp had settled around 63,5 deg C. Measured right above the cascode fet, so I guess this is the hottest point. Thats a bit too much for my liking. I am considering to modify the chassis at this point. If the sinks with horisontal fins (not vertical as I said above) are cut in half and each half turned 90 deg. they would be able to dissipate more heat. So there goes the F-amp look I wanted But what, better safe than cooking

Steen

 

[steenoe]

I have connected the fets through leads and placed them evenly on the heatsinks. That helped a lot. I have to admit that the boards of PD and Veteran invites you to place the fets close to the topend of the heatsink. In this case it was a nono!!! Placing the fets at around the middle line of the sinks did the trick Aftermathing on that: its pretty obvious isnt it?

Steen

PS. Looking at PassDIY I realised that there wasnt any ZenV9 present!!! Too bad I thought, and send a note with some pic's to the webmaster. Hope they accept it. The ZenV8 and 9 came out some time ago now and its weird that noone posted yet??

 

[Winding Man]

Beautiful amp - thanks for sharing the pics!

WM

 

[Gooch]

Awesome job looks very nice I bet it sounds good.

Regards,

Dave

 

[Babowana]

Placing the fets at around the middle line of the sinks did the trick ...

... wasnt any ZenV9 present!!! ...

No ZenV9 yet. Reserved it until getting tired of with the current goodies.

 

[steenoe]

Awesome job looks very nice I bet it sounds good.

Doooh, nearly forgot: Thanks a lot Yep it sounds great allright, I am sure many of the Zen builders around here, will be surprised about the sound of this J-fet amp

Steen

 

[Nelson Pass]

Congratulations.

 

[Babowana]

Awesome job looks very nice I bet it sounds good.

Doooh, nearly forgot: Thanks a lot Yep it sounds great allright, I am sure many of the Zen builders around here, will be surprised about the sound of this J-fet amp

Where is the look?

 

[jleaman]

Are your speakers home made ? They look really nice and appropriate for that setup too. !!

Nice work.

 

[steenoe]

Congratulations.

Thank you very much

Where is the look?

You will find the picture's in the start of this thread.

Are your speakers home made ?

Yes, its a pair of selfmade Proac Response clones. I veneered them with Elm tree.

Steen

 

[BillWW]

Are your speakers home made ?

Nice work.

If they were mine, I would prefer they were called custom built or made.

 

[jleaman]

Thank you very much
You will find the picture's in the start of this thread.
Yes, its a pair of selfmade Proac Response clones. I veneered them with Elm tree.

Steen

Well they look REALLY good. I like them. I hope that i can get my speakers that im building done some day.

 

[steenoe]

Well they look REALLY good. I like them. I hope that i can get my speakers that im building done some day.

Thanks J' I am sure you will finish them someday. As always when building something, you want to finish tomorrow But it rarely goes that way, does it! With a little patience, you can achieve your goal. Here is another piccie of the speaker, as you can see the veneering sheets were selected so that the front veneer fibre markings, continued on the top

Steen

 

[Gooch]

Nice Speaker Steen

Nice Speaker Steen

Zv9 has know problem driving them the sensitivity of then in the high 80
I am building similar design to those I think I am going to need more power though
I am thinking of building a Aleph 5 but have to fine some heatsinks


Regards
Dave

 

[steenoe]

Hi Gooch. Thanks. If you are building Proac Response 2.5 clones, an Aleph 5 is just the thing, allright The speakers impedance doesnt dip too much, but the efficiency is lacking, a lot

Steen

 

[Zen Mod]

ugly!