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09-13-2019, 10:23 PM
Hi Kevin,
I hope you don't mind me imposing on your expertise again.
I have now done most of the work to this Blues Deluxe and due to the difficulty in wiring the existing relays, to mute the Drive stage, I am considering adding another relay.
In Clean mode, this will mute both the input and output of the Drive stage, which will prevent any High Gain signal being created and mute any noise from the Drive stage output.
I am concerned that without the mutes, I will reassemble it all, only to find that there is some distorted signal riding on the clean sound and then it will have to be disassembled to rectify the problem. I have done so much work on this amp now that I think it is unwise, not to finish it off properly. I think prevention is better than a cure.
With the components, for the extra gain stage, mounted on an aux. board, connecting to the relevant grounding points will be much easier.
If I can add another relay to the existing circuit, the (foot & panel) switching will activate the added relay as well.
The relays fitted by Fender are OMRON 24V DPDT and I have some in stock, which I can use for this purpose. (I also have other DPDT relays: 6V, 12V and 48V.)
My only concern is whether the +-16V power supply will handle another relay.
There will then be two Relays on and one off, in one mode - and one on and two off in the other.
My knowledge of SS electronics is not the best and I would appreciate your advice on the best method of wiring in another relay and whether this is feasible.
The +- 16V supply is known to draw enough current to overheat the dropping resistors R85 & R86 to the point of cooking the PCB (which has happened to this amp).
My solution to this problem, on other amps, has been to remove these 5W resistors from the PCB and mount new aluminium body 15W resistors to an external heat sink; which I am doing to this amp also.
I have attached the Blues Deluxe Schematic.
Thanks again, for your help.
Noel
PS: I also need to have a talk to you about buying some Power Scaling Kits, now that I'm back into the amp work. Should I contact you via the forum, or the LP phone or email contacts?
Blues_Deluxe REV G.pdf (Size: 343.81 KB / Downloads: 6)
I hope you don't mind me imposing on your expertise again.
I have now done most of the work to this Blues Deluxe and due to the difficulty in wiring the existing relays, to mute the Drive stage, I am considering adding another relay.
In Clean mode, this will mute both the input and output of the Drive stage, which will prevent any High Gain signal being created and mute any noise from the Drive stage output.
I am concerned that without the mutes, I will reassemble it all, only to find that there is some distorted signal riding on the clean sound and then it will have to be disassembled to rectify the problem. I have done so much work on this amp now that I think it is unwise, not to finish it off properly. I think prevention is better than a cure.
With the components, for the extra gain stage, mounted on an aux. board, connecting to the relevant grounding points will be much easier.
If I can add another relay to the existing circuit, the (foot & panel) switching will activate the added relay as well.
The relays fitted by Fender are OMRON 24V DPDT and I have some in stock, which I can use for this purpose. (I also have other DPDT relays: 6V, 12V and 48V.)
My only concern is whether the +-16V power supply will handle another relay.
There will then be two Relays on and one off, in one mode - and one on and two off in the other.
My knowledge of SS electronics is not the best and I would appreciate your advice on the best method of wiring in another relay and whether this is feasible.
The +- 16V supply is known to draw enough current to overheat the dropping resistors R85 & R86 to the point of cooking the PCB (which has happened to this amp).
My solution to this problem, on other amps, has been to remove these 5W resistors from the PCB and mount new aluminium body 15W resistors to an external heat sink; which I am doing to this amp also.
I have attached the Blues Deluxe Schematic.
Thanks again, for your help.
Noel
PS: I also need to have a talk to you about buying some Power Scaling Kits, now that I'm back into the amp work. Should I contact you via the forum, or the LP phone or email contacts?
Blues_Deluxe REV G.pdf (Size: 343.81 KB / Downloads: 6)
