Re: 8 Channel, 3U NEVE 1073 completed
« Reply #2260 on: May 03, 2019, 04:18:36 PM »
I order from AML exactly the BOM part for EZ1290 ( 71BDF30-03-1-AJN ) and the Carnhill transformers from AML as well so no wrong parts there...just wondering what it hidden to cause the POP sound problem?


Re: 8 Channel, 3U NEVE 1073 completed
« Reply #2261 on: May 03, 2019, 04:24:07 PM »
All capacitors values and polarity are correct and my resistors are RPR 9372 series with clear values label and I do double check with DMM and placement on PCB before solders... I could live with the click but just curious what may have caused the POP..?

Re: 8 Channel, 3U NEVE 1073 completed
« Reply #2262 on: May 03, 2019, 04:26:46 PM »
Typo error: PRP resistors:)

Re: 8 Channel, 3U NEVE 1073 completed
« Reply #2263 on: May 03, 2019, 06:11:34 PM »
what's an idiot i am. I've found the problem the switch is a wrong one should be non-shorting, but somehow my ordering was a mistake one with the shorting switch...well i'm very sorry you guy for all the trouble try to help me out...I guess i have to order a few more correct non-shorting 71bdf30-03-1-ajn and more Carnhill from Colin again for few more channel build....thank you to great service from AML...and GroupDIY members...

Potato Cakes

Re: 8 Channel, 3U NEVE 1073 completed
« Reply #2264 on: May 03, 2019, 06:18:17 PM »
what's an idiot i am. I've found the problem the switch is a wrong one should be non-shorting, but somehow my ordering was a mistake one with the shorting switch...well i'm very sorry you guy for all the trouble try to help me out...I guess i have to order a few more correct non-shorting 71bdf30-03-1-ajn and more Carnhill from Colin again for few more channel build....thank you to great service from AML...and GroupDIY members...

No worries. Glad you found it.

My four channel ez1290 that I built a while back I used 3055 instead of 2955 for the output transistors, so the shame is shared when it comes to installing the wrong parts.

Thanks!

Paul

Re: 8 Channel, 3U NEVE 1073 completed
« Reply #2265 on: May 04, 2019, 12:08:23 AM »
Just want to share a brief comparison between EZ1290 to Hairball Lola even though they’re totally different design Preamp topology, but they do share the same I/O transformers clone after 10468 and LO1166.  The EZ1290 got a little more bottom end punchy and more focus, the Lola got little more details and open; however, they sound so similar in character of each other...I was surprise a bit on the Lola very well designed Preamp in my opinion... I will build 2 more EZ1290 as well as 2  more Lola...Neve flavor is so addictive...

dp

Re: 8 Channel, 3U NEVE 1073 completed
« Reply #2266 on: May 10, 2019, 12:48:46 AM »
awww nuts... just as i decided to build one EZ1290 and one ML12 in the same chassis, DIYRE goes and runs out of PCB's...  :(

JW

Re: 8 Channel, 3U NEVE 1073 completed
« Reply #2267 on: May 14, 2019, 12:31:12 PM »
what's an idiot i am. I've found the problem the switch is a wrong one should be non-shorting, but somehow my ordering was a mistake one with the shorting switch...well i'm very sorry you guy for all the trouble try to help me out...I guess i have to order a few more correct non-shorting 71bdf30-03-1-ajn and more Carnhill from Colin again for few more channel build....thank you to great service from AML...and GroupDIY members...


I thought the "n" at the end of the switch part number indicated that it WAS non shorting. At least that's what the grayhill document I attached a page ago says. Anyway, I should mention that I emailed grayhill about the difference in part numbers between 71bdf30-03-1-ajn and 71bdf30-3-pjn (at mouser) and they said it was the same exact switch. It's just that they (abbreviated?) it.

Indeed when I ordered the mouser switches with the pjn suffix, they arrived with the 71bdf30-03-1-ajn part number on them. I've since soldered them to my boards.


JW

Re: 8 Channel, 3U NEVE 1073 completed
« Reply #2268 on: May 14, 2019, 12:37:05 PM »
Do the spacers under the output transistor heatsink need to be conductive or it doesn't matter (?) Looks like the heatsink itself is part of the circuit (transistor case) and supposed to connect via the mounting nuts underneath? Or is there supposed to be an isolating pad underneath the transistor? There is no mention of these in the build document.

Potato Cakes

Re: 8 Channel, 3U NEVE 1073 completed
« Reply #2269 on: May 16, 2019, 01:10:29 AM »
No to both. You'll notice the pads where you bolt the transitor to the board are isolated from the ground plane. Unless you do something to cause a short with the bolt/nut to some other trace/connection, it won't matter if your fasteners are conductive.

Thanks!

Paul


dp

Re: 8 Channel, 3U NEVE 1073 completed
« Reply #2270 on: May 17, 2019, 02:11:36 PM »
Is there another USA source for the EZ1290 PCBs? I really want to make this my summer vacation project and I have a potential client who wants me to build them a few channels if they end up liking mine.

madriaanse

Re: 8 Channel, 3U NEVE 1073 completed
« Reply #2271 on: May 24, 2019, 03:08:31 AM »
Is there another USA source for the EZ1290 PCBs? I really want to make this my summer vacation project and I have a potential client who wants me to build them a few channels if they end up liking mine.

Hello, more boards have been ordered and should be back in stock soon here: https://www.diyrecordingequipment.com/products/ez1290-preamp-pcb

Sorry for the delay but you may want to order all the parts from the UK. Those always take a while.

M.

dp

Re: 8 Channel, 3U NEVE 1073 completed
« Reply #2272 on: May 24, 2019, 11:10:18 AM »
Yeah thanks. He emailed me last week and said they would be in-stock in about three weeks. That gives me time to get my BOMs all in order and order the other parts I will need. Probably won't be able to start until July anyways.  8)

dp

Re: 8 Channel, 3U NEVE 1073 completed
« Reply #2273 on: June 01, 2019, 01:04:32 PM »
These are back in stock at DIYRE for anyone interested in knowing.

BUT, in the meantime I have decided to go a different direction... I'm going to go the 500-series DIY route instead after completing my BOM and discovering this is going to be a pretty darn expensive project. I'm sure it's worth every penny spent but I just can't swing that expense right now.

madriaanse

Re: 8 Channel, 3U NEVE 1073 completed
« Reply #2274 on: June 08, 2019, 10:41:31 PM »
Understandable. That Carnhill iron comes with a hefty price tag. Totally worth it though!  ;D

dp

Re: 8 Channel, 3U NEVE 1073 completed
« Reply #2275 on: June 09, 2019, 12:48:52 AM »
Understandable. That Carnhill iron comes with a hefty price tag. Totally worth it though!  ;D

No doubt. Someday...


 

Related Topics

  Subject / Started by Replies Last post
13 Replies
5886 Views
Last post September 12, 2005, 09:29:36 PM
by Aryuserius?
735 Replies
198458 Views
Last post April 25, 2016, 08:24:41 PM
by Whoops
17 Replies
6149 Views
Last post February 12, 2015, 11:29:36 AM
by Potato Cakes
18 Replies
13854 Views
Last post November 26, 2011, 07:10:36 PM
by a zombie