Recent Posts

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Randall Solid State Amplifiers / Re: RX120 cut out and quit completely
« Last post by Phillnut on April 19, 2018, 02:01:52 AM »
I want to quit smoking. what should I do I do not want to smoke it anymore.
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Randall Tube Amplifiers / Re: RT100 Pre Amp Valves
« Last post by Phillnut on April 19, 2018, 02:00:58 AM »
I'm wanting to change the valve. Can you recommend me?
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Randall Solid State Amplifiers / Re: RX120 cut out and quit completely
« Last post by nuning on April 11, 2018, 03:11:54 AM »
 RX120 cut out and quit completely. I want to do this.        royal1688 
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Randall Solid State Amplifiers / warhead X2 Schematcs Help
« Last post by martinomma on March 31, 2018, 03:36:07 PM »
Hello to all . for some time my beloved x2 sounds very bad. I would have to recover the schematics to try to solve the problem. has anyone already had problems with this head?
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Randall Solid State Amplifiers / Amp/Cab Ohm Matching - Please Help
« Last post by metaldome on March 28, 2018, 07:42:19 PM »
1) So I bought a Randal RG100ES amplifier head and from what I can see it has two 8 ohm outputs on the back. In the manual it says "Less than 8 OHM load impedence is not recommended" but then in the specifications it says "120 watts RMS @ 4 ohms" and "80 watts RMS @ 8 ohms." Why is it listing watts @ 4 ohms if less than 8 ohms is not recommended?

2) I also bought a Randall USM-RV412S 270 watt speaker cabinet, it has a switch on the back which can be set to stereo (two 8 ohm inputs) or mono (one input is 4 ohms and the other is 16 ohms). I believe it would be alright to connect the 8 ohm amp output to the 16 ohm mono cab input, correct? If so how many watts will I be getting?

3) What are my other options? Is it safe to go from an 8 ohm amp output to the 4 ohm mono cab input? Is there any way to make the cab 8 ohms to match the amp? I believe if I switch to 8 ohm stereo each input will only power two of the four speakers? Could I run two speaker wires, one from each 8 ohm amp outputs to both of the stereo 8 ohm cab inputs? How would that affect wattage?

Thank you for any help!
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Randall Tube Amplifiers / RT100 Pre Amp Valves
« Last post by scottravenhill on March 19, 2018, 06:59:54 AM »
Hi Guys,

This has probably been asked a million time so sorry for being such a noob!

I purchased my first all tube amplifier last year, the RT100H.

I've had a lot of fun with it so far and did the pre amp tube swap mentioned in other posts, (p2 & p5 including covered valve) or (p1 & p4 excluding covered valve)

Anyway, recently I'm getting a lot of loud microphonic noise in the clean channel, so I figure its time for a set of new valves rather than just one, as I bought the amp second hand and have no idea how old they all are. I am also not sure if I need to replace the input valve or just the 4 uncovered valves?

I'm really looking for reccomendations of that to replace them with. There are so many options available its all a little overhwleming to be honest! I have been looking on http://www.hotroxuk.com/matched-valves-links-page-12ax7-6l6-909-0/preamp-valves-12ax7-ecc82jj-12ax7m-hot-rox-uk-1885-0.html

Any help would be greatly appreciated!

Thanks in advance!

Scott
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General Discussion / Irvine,CA hardrock model!
« Last post by Boomarang on February 26, 2018, 06:51:16 PM »
I can not find a year on this. I also have never seen a hardrock. Can anyone tell me about this? I have a ton of pics but do not know how to post them on here. Please help:/
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Randall Tube Amplifiers / RT50C with a load box
« Last post by wilkinsi on February 13, 2018, 09:12:39 AM »
A) If I want to use the RT50C with a load box:
1) Do I have to modify the amp, so that the built-in speaker is muted? Please describe procedure if this is the case. Can I still easily and safely revert to using the in-built speaker if needed?
2) Do both the 8ohm and 4ohm cab outputs have to be connected?

B) I want to switch amp channels using a Line 6 Helix, but the footswitch port is not directly compatible. Is there an adapter I can buy?

C) Assuming I need to get these modifications made by a specialist, is it cost effective, or am I better off buying a head and separate cab? The amp is sitting in a shop, but no-one is interested, so I'm thinking of taking it back and modifying it.

Thanks in advance.
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Randall Solid State Amplifiers / Asking for help. Randall RRM 2-200
« Last post by VSAT88 on February 06, 2018, 08:03:43 PM »
Hi, new here so forgive me please if I break protocol. I have a Randall RRM 2-200 and I would kind of like to get it back up and running. It is trashed completely out but I like it anyway . I cannot find a schematic/drawing anywhere even on the pay sites. It is a very simple amplifier as far as I can see and I am making good progress but I really could use a schematic for things like the OPT. The outputs have been changed and I have no clue what the originals were and that makes it hard for me to match for new. Anyway, thanks in advance. Jim.
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Randall Solid State Amplifiers / Switchmaster 150
« Last post by Djwhitjr on February 04, 2018, 10:28:58 AM »
Does anyone have any information on this amp?  I recently bought it with a guitar.  I can't find much info on it and was wondering what it's worth.  I already have 4 amps in the house so a 5th just isn't going to cut it with the misses.   ;D

Randall Front by Dan Whitney, on Flickr

Randall Back by Dan Whitney, on Flickr
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