mac

Re: JLM Baby Animal
« Reply #1020 on: February 14, 2011, 05:43:35 AM »
Have u searched the jlm forum?
Barclaycon: The client said 'That sounds great, what are you using on it?'
The engineer's reply was: '30 years of experience'.


dribro

Re: JLM Baby Animal with OEP 262A2C
« Reply #1021 on: April 18, 2011, 11:08:58 AM »
Hello fellow diyers!

does anybody knows if the OEP 262A2C can be fitted as the LL1578 & XL with 1:10 ratio like shown on the JLM site?

The traffo is 1+1:2+2

Regards,
Adriano


matta

Re: JLM Baby Animal with OEP 262A2C
« Reply #1022 on: April 18, 2011, 04:14:33 PM »
Hello fellow diyers!

does anybody knows if the OEP 262A2C can be fitted as the LL1578 & XL with 1:10 ratio like shown on the JLM site?

The traffo is 1+1:2+2

Regards,
Adriano

No you'd need to have the OEP 262A3C to achieve that kind of ratio/gain, set it to HIGH RATIO and it would achieve a 1:12.9 Ratio.

Cheers

Matt
Matt Allison
www.matt-allison.com

Quote
We are not going to start thinking of ways to get an octopus to commit a crime, cause that just has failure written all over it – Earl J Hickey

dribro

Re: JLM Baby Animal
« Reply #1023 on: April 18, 2011, 05:37:06 PM »
thank you!

mupson

Re: JLM Baby Animal
« Reply #1024 on: August 05, 2011, 05:44:40 AM »
Hello,
Since I don't have output transformers, can I integrate the JLM power supply inside the chassis of my BA4 ?
Besides, while roaming for infos on the web, I remember seeing pictures of someone doing surgery on a PS, but I can't find the page anymore...
Does anyone know what that was about ?
Thanx.
M

3nity

Re: JLM Baby Animal
« Reply #1025 on: August 05, 2011, 08:46:43 AM »
ive done that before.
ive had no problems!
Good luck!
Life is a path, death the destination.

3nity

Re: JLM Baby Animal
« Reply #1026 on: August 08, 2011, 05:50:48 PM »
Hi you can add a picture by attachement when posting. look and you'll find!
Life is a path, death the destination.

3nity

Re: JLM Baby Animal
« Reply #1027 on: August 09, 2011, 09:22:58 AM »
See the window when you post a message when youre done you hit the POST button.
well if you look to the left and a few lines upper of that button you ll find the ''Attachements and other options''
thanks.
Life is a path, death the destination.

mupson

Re: JLM Baby Animal
« Reply #1028 on: August 09, 2011, 10:25:26 AM »
Howdy,
Minor customizing : as I don't have output transformers in my BA4, I was able to use the holes on the back of the chassis to add balanced output jacks.
M

http://www.mupson.com/
« Last Edit: August 12, 2011, 04:48:18 AM by mupson »

mhelin

Re: JLM Baby Animal
« Reply #1029 on: December 26, 2011, 05:04:30 PM »
Hi,
Anyone know where to get (in EU ) the DPDT toggle switch right angled 90 deg with threaded bushing fitting BA PCB?
JLM ones are Salecom T8021L Series.


mhelin

Re: JLM Baby Animal
« Reply #1030 on: December 27, 2011, 06:16:33 AM »
Threaded ones seem to be rare. From Digikey found these:

http://search.digikey.com/fi/en/products/7201P3CWAV2SE/CKN9728-ND/2055006 (in stock)
http://search.digikey.com/fi/en/products/M2022SS1W40/M2022SS1W40-ND/1046963 (in stock)
http://search.digikey.com/fi/en/products/100DP1T6B11M7REH/100DP1T6B11M7REH-ND/1803097 (inexpensive, not in stock)

Guess JLM Audio is still the best place to leave an order.

ciscan.81

Re: JLM Baby Animal
« Reply #1031 on: June 24, 2012, 08:45:44 AM »
Hi BA fans...

I'm building a BA in a 312-style with the following specs:

EA2622 Input transformer
Scott Liebers 2520 red-dot opamp
EA2623-1 Output transformer (wired 1:2)
CL = NF
CZ = 220pf
RZ = 5k1
RL = 15k and 100k log pot
47pF caps changed to 220pF
Output trim 1k dual log pot with 1k series resistors wired after output trans

My question is about input transformer ratios. I know this has been discussed at great length on the 312 thread and others, but I haven't been able to find the specific answers I'm after.

...And so my questions are:

What ratio should I run a EA2622 at in a BA to render a sound similar to a 70's era 312? Low 1:3.5 or High 1:7?

From what I can gather most seem to favour 1:7?

Joe has suggested I should wire 1:3.5:

Quote
...it 2 primary windings so low ratio will give 600ohm input with normal 15k load which is 1:3.5 ratio

I thought I'd give him a break from my persistent questioning and offer my query up to the knowledgeable folks around here. ;)

What 'should' the ratio be to give me that vintage 312 tone everyone talks about...does it make a big difference?

I'd also like to know: If I change the ratio of the input trans this also has an effect on the input impedance...? Yes?...So will my variable z pot or series resistor attached to it need changing also? (am I right in thinking a useful input impedance range is something like 150ohm-1500ohms?)

Any thoughts on any of this would be really appreciated.  But please bare in mind when answering I am new to DIY, and still trying to wrap my head around some concepts here! ???

Many thanks

benqbasic

Re: JLM Baby Animal
« Reply #1032 on: April 13, 2015, 06:23:14 AM »
Hi guys.
I realise this is an old thread. But does anyone have the measurements for the front switches on the BA or a fpd file.

Many thanks.

MatC

Re: JLM Baby Animal
« Reply #1033 on: September 07, 2018, 10:04:17 PM »
Hi guys,
Unsure if this thread is still active, but hey worth a shot.
I have a BA4 that 1 channel in not functioning correctly on.
The symptoms are that the DI section seems to still function aside from the fact that I cannot gain it up.... Any idea where I should be looking?  I'm guessing its likely a transformer or something like that but just don't want to order a tonne of parts for no reason :/

Cheer
Mat


 

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