Relay switching board in the KEL84

[Borats Baby]

Hi, I'm new here so go easy on me....

Does anybody know where the htr+ and htr- wire goes to, from the relay switching board when fitted to the KEL84.. the instructions dont say..

Thanks

Rikki

[Dave the bass]

On the WD88VA they go across the +/- of the heater bridge rectifier. It's a 6.3 volt heater circuit, dunno it thats the same as the KEL84. The relay board operates on between 5-6 volts DC I've learn't today.

Have you phoned WD HQ, they're very helpful.

DTB

[John Caswell]

Hi all,
It is most important to get the supply to the relay board the correct way around otherwise you will poop off the diodes across the relay coils.
I have just had a look at the board and it is marked heater + and heater - so that should sort bit out.

John aka Dr John

[Borats Baby]

Hi all,

I think I've sussed the relay board out now.

New problem though

R1 is smokin on power up.........

I think I have been given the wrong rating, same happened to someone else I know who built one !

Also, the instructions I've got are for (I think) the older one with a tape switch. Mine has no tape switch fitted.....strugglin now to get the selector and volume pot wired in correctly as the instructions are for the 'non relay board' fitting.....

Any help ??

[Mike G]

Hi,

As DTB said in his post "Have you phoned WD?" They are very helpful indeed, and i'm sure if you have earlier instructions for the latest amp, they will sort the problem out for you.

I suspect many of us have earlier WAD KEL84's with the tape switch, but not that many BBer's will have seen the latest WD model.

I'd give them a call.

Mike.

[petercom]

Sorry you are having problems with this.

I've sent you the diagrams showing how the relay switch board heater supply is linked to the pcb.

In terms of the input switch and volume control, ignore the instructions for the 'wired' version and follow the relay switch board instructions. The input switch is connected using the multi-core cable to the relay switch PCB. From the relay switch PCB you take the Outputs to the volume control via a pair of screened leads.

We are in the process of completely rewriting the instructions but, as you can imagine, this is taking some time!

[Borats Baby]

Peter, I've sorted the relay board issue now, thanks for your help on that. However, I need your help re: R1.

I have removed one side of R1 (2.2K). I have seperated the power supply from the channel stages by removing resistors :

R6/7
R10/11
R12/13
R34/35

Also the 2 yellow wires to the output transformers. This has left the power
supply as a stand alone section, with no output load.

When I check at the choke, I'm getting 335 v dc, which shoud drop slightly when I reconnect R1.This looks good to me.

However, when I reconnect R1 to complete the power supply stage, R1 smokes badly (high current draw).

Before I start to remove and check the rectifying diodes/caps, I would like your feedback on this.

Any help would be appreciated.

Thanks

Rikki.....