Engl Power Ball channel changing issues

[Arbutt]

Hi all
Well i'm still isolating after having Covid. But i was looking at this one before i went down with it
It came in with with the reported fault of powering up but no sound. V5 having a O/C Anode resistor, Replaced the 100K ( By memory R9) it was all working, Once i checked it all out I found CH2 to very low output Where channel 1 was perfect.... Also found channel 1 or 2 Gain pots having an effect on the volume levels regardless of what channel is engaged
When you select Channel 1 or 2 the LED for that channel is up and the other channel LED is off, Same on Foot s/w
I traced the fault correctly i hope to LD1 or LD2 being faulty, I spoke to ENGL and was told no longer available
Engl_powerball.pdf
while im away was hoping to order the parts from somewhere so when i return i can catch up and replace them
To get to them i have to remove the main board, was hoping just to remove the board and then replace and resolder all the board back.

any thoughts on my diagnoses and what ones i should get

Many thanks
Mr A

[Jon Snell]

I think you will find it is a very common Vactrol.
https://www.newark.com/excelitas-tec...vrms/dp/43F885

[Arbutt]

I think you will find it is a very common Vactrol.
https://www.newark.com/excelitas-tec...vrms/dp/43F885

thanks. The link says its NLA , ebay have some from usa and china. Watford valves have some at over £10 each
But at least i know what to change it for
thanks
MR A

[Jon Snell]

I had an issue with an Engl recently and these from On Semi are electrically identical;
And available from RS in the UK part number 807-6585
They rarely fail unless like my repair, someone was fiddling and damagede two of them.
These are direct replacements for the Egnator.

[Arbutt]

I had an issue with an Engl recently and these from On Semi are electrically identical;
And available from RS in the UK part number 807-6585
They rarely fail unless like my repair, someone was fiddling and damagede two of them.
These are direct replacements for the Egnator.

Thank you i will try them, cheaper than the others from Hot roxs or watford valves
have a good day
Mr A

[Pedro Vecino]

You mention gain 1 and gain 2 (separately) so I imagine it's a Powerball II. I haven't had any but I have had many Powerball I and the switching system on these is made entirely with relays, just like Thunder, Screamer, R. Blackmore, Savage, etc.

[Arbutt]

You mention gain 1 and gain 2 (separately) so I imagine it's a Powerball II. I haven't had any but I have had many Powerball I and the switching system on these is made entirely with relays, just like Thunder, Screamer, R. Blackmore, Savage, etc.

I got a very low Channel 2 channel 1 is ok whatever channel you are on the gain from both channel have an effect on the sound. Looking at the circuit you can see that the LD1 or LD2 are allowing the signal of choice to go into V5B

[Pedro Vecino]

Thanks. It went unnoticed by me.