Randall RM50 & RM80 Reverb question

[Smath22]

I notice the RM50 head has reverb, but none of the others amps in the range seem to have it, i have two questions?

1) Is the reverb on the RM50 head any good?

2) How is it controlled as i dont see a dedicated pot for it?

Thanks in advance for your help

 

[kc2eeb]

The reverb circuit is built on a circuit board that is attached to the reverb pan.
There is no reverb circuit in the amp chassis itself. The control on the amp is the effects return knob in the parallel loop. There is a 9 volt AC jack on the amp chassis near the input jack that the reverb pan assembly plugs into.
I personally like the reverb. The drive signal going to the reverb circuit is controlled by the master volume on each module, so, you can see how it would vary depending on how you set the modules. I will eventually add an in-line trim pot to the effects send line to the reverb to tame the drive signal down with some modules.

 

[Smath22]

Ah that makes a lot of sense thanks for your answer. Just need to decide wether I buy a RM4 or the RM50 head.

 

[kc2eeb]

If you buy the RM4, you can still use the reverb tank assembly from a RM50/80. Of course, you need to buy the assembly from someone on the forum. You then need a 9 volt AC (NOT DC) wall wart that can supply 500ma or so. You have to wire the correct socket to the supply.
The circuit on the board attached to the reverb pan has a rectifier and filter built in.

 

[BigBrewtus]

I usually never liked reverb too much until I got my first RM50. It surprised me.

 

[kc2eeb]

The reverb is actually quite good. It can be very "Fendery" with the right modules.

 

[Smath22]

I do like the idea of the RM50 head with built in reverb but i cant help but think 2 modules is not going to be enough for me looking at all the ones availble. RM4 with a matrix power amp is where i'm leaning at the moment.

 

[GtrGeorge!]

I wasnt impressed with the spring reverb on my rm50..I was playing 90s stuff and it never sounded quite right...
wasnt awful, I just prefered the rooms I could create with my Gmaj2,by far.

GtrGeorge

 

[raimdal76]

how the 9v AC cable plug into the reverb tank in randall rm50?

 

[warmachine67]

There was a 9v female barrel receptacle on the bottom on my RM50. It is somewhere around the preamp tubes. It is hard to spot, but it is there. Hope that helps.

 

[raimdal76]

The reverb circuit is built on a circuit board that is attached to the reverb pan.
There is no reverb circuit in the amp chassis itself. The control on the amp is the effects return knob in the parallel loop. There is a 9 volt AC jack on the amp chassis near the input jack that the reverb pan assembly plugs into.
I personally like the reverb. The drive signal going to the reverb circuit is controlled by the master volume on each module, so, you can see how it would vary depending on how you set the modules. I will eventually add an in-line trim pot to the effects send line to the reverb to tame the drive signal down with some modules.

hi, how the 9 volt ac jack goes into the reverb tank? usually reverb tank has only rca connections..I want to install a reverb tank in my randall rm50. Thanks a lot.

 

[raimdal76]

The question is: I don't understand how the 9volt cable under the chassis goes into the reverb tank. Do I have to do some soldering or do I need some specific cap or plug? Thanks a lot


All the best for you.

 

[raimdal76]

at 5:45 you can see the connection

 

[Burlo]

The 9v connects to the circuit board that is attached to the underside of the reverb tank.

 

[Burlo]

Here’s a pic of mine after I replaced it with a more Fender-like reverb tank and I’m really happy with the result. The PCB is underneath the tank and you can see the power cable round the back.

Tube Town in Germany has PCBs that can be used to retrofit reverb tanks. Kit LNDVerb

Apparently, you can take a high voltage tap from elsewhere on the circuit so no need to create a specific 9v outlet but, on the down side, you still need a reverb transformer.

 

[raimdal76]

Is this kit already compatible such as voltages, ohms, 9v AC power supply, etc?

 

[Burlo]

Here’s the link to the data sheet in English.

https://www.tube-town.net/info/datenblaetter/kits/lndverb_en.pdf

I’ve not fitted it myself so I haven’t looked into it in much detail. But you should be able to get the type of tank you want. If you’re not familiar with the technical side you could ask an amp tech to take a look at it.

Is this kit already compatible such as voltages, ohms, 9v AC power supply, etc?