FF and JLM together at last

My first submitted DIY and although not quite finished I am glad to be at the end of this one with good result. Incredible gain with real low noise, will test out further this week. I have put a ribbon, a 58, LD,SD condensor through it
some tweaking to go yet but I am happy after what seemed a nightmare of problems. I had just finished doing Peterc's green pre (4 of them ) and had worked out the problems I had with these quite readily. The 99jlmv's were a challenge, at one monent I had thought I had toasted my 992's. Deep breath.......... pics
http://i5.photobucket.com/albums/y181/josan1/1640.jpg
http://i5.photobucket.com/albums/y181/josan1/1639.jpg
http://i5.photobucket.com/albums/y181/josan1/1636.jpg

Nice work! What's the input tranny?

Samuel

It looks like the JLM 1:4 input transformers made by Joe.

Yep Joe's tranny

Josan
Any hints on building the JLM99s, i'm just starting mine today. What problems did you encounter?
Vikki(uk) :grin:

Desoldering the board is not fun so be really careful on what goes where
I destroyed one of the relays and had a hard time pulling it off the board.
I originally was going to use Lundahls but decided to go with JLM's input tranny which there was not too much of a difference (or so I thought ) in the layouts. The new PDF of the JLM input trannies is not the same as one I had downloaded I searched around and found an old layout with the JLM input tranny and this worked as I was not putting an output transformer on. Oh and don't forget the jumpers they are not on the schematics but on the board layout, this caused a few anxious hours.
I am glad of the results, I have never heard my AT 4047 with that much presence ( I am using Forssells 992s) can't wait to get recording with it.

Thanks, i'll take care.
Vikki(uk) :grin:

Can anyone give me an idea what sort of current a single JLM99 takes? What current rating toroid is recommended for a couple of channnels
Vikki(uk)

A 25vac or 50vac Centre Tapped 30va transformer will run 2 to 4 Dual 99v kits just fine.

Joe

www.jlmaudio.com

:thumb: