T4UA repair (t4 cell in UA610)

[Aleguitarpro]

Hi.
I'm trying to repair my T4 cell in my UA610.
The EL panel are gone so I'm trying to replace it with something similar.
I read the threads on replacing the EL panels in T4b cells with LEDs and Vactrol but I'd like to preserve the original card in its place so I've tried with LEDs.

I've done this steps:
1) two 5mm Green LEDs in series with a diode across LEd's legs in reverse-parallel to prevent reverse voltage
Not the same GR as original EL panel.

2) two 5mm Yellow LEDs in series with a diode across LEd's legs in reverse-parallel to prevent reverse voltage.
Less GR than Green led.

3) two 3mm super blue LEDs in series a diode across LEd's legs in reverse-parallel to prevent reverse voltage and a piece of trasparent tape to diffuse light.
More GR but not the same with original EL panel.

Also I think to desolder the cap across positive rail of EL panel... is a good idea?
How can I get more GR?
It depends on the brightness of the LEDs or on their dimensions?
Has anyone ever been able to repair/modify a T4UA?

Thanks for your help.
A.

 

[SSLtech]

I've built LOTS of T4 type aggregations with LEDs, and I see lots wrong with your attempts here... -Since I may sell such things in the future, I won't give away everything I've learned, but I will say this:

NEVER parallel LEDs. -Just NEVER.

You want an El panel?-I'll sell you one!

 

[Aleguitarpro]

I've built LOTS of T4 type aggregations with LEDs, and I see lots wrong with your attempts here... -Since I may sell such things in the future, I won't give away everything I've learned, but I will say this:

NEVER parallel LEDs. -Just NEVER.

You want an El panel?-I'll sell you one!

Thanks for reply.
Excuse me for my bad description but I made a mistake with the translation: the LEDs are not in parallel but in series (I modified the first post) and I put a diode across LED's legs in reverse-parallel to prevent reverse voltage (I see it in the vactrol-made T4b).
I've tried to put my diy vactrol-based t4b but it doesn't work inside UA610.
In my UA610 I measured voltages that I have in the EL legs with a sine wave at 0db 1000Hz and GR pot at maximum and it's about 12-14Vac.
The resistors I've in my diy vactrol-based t4b are too big to work inside UA610 with this voltages so I opted to use LEDs instead the hard to find EL panel.
The 2 leds are directly soldered in the place of EL panel but the only big problem I've is that GR in too little with LEDs respect its original behaviour and I'm wondering how to fix this.
Obviously the superblue LEDs are brighter in general terms but at the same voltage probably normal green LEDs react better...
So, this is the path of my attemps.
A new EL panel is the best option, anyway!

 

[SSLtech]

You'll never make it work at that distance. The 'lensing' of the LED is such that it puts out a "cone" of light. -You'll see that it only covers a small portion of the photoelectric surface unless you move it about 20mm away from the LDR.

I'm pretty sure I have a spare EL panel that will work for that. -Can you post dimensions?

 

[Aleguitarpro]

You'll never make it work at that distance. The 'lensing' of the LED is such that it puts out a "cone" of light. -You'll see that it only covers a small portion of the photoelectric surface unless you move it about 20mm away from the LDR.

I'm pretty sure I have a spare EL panel that will work for that. -Can you post dimensions?

I've tried to move the LEDs and the results are much better.
The EL panel is 3,1cm x 2,1cm (but 3x2 is the same).
I've tried to send you a PM but your inbox is full.
Thanks again!

Ale