Search found 99 matches

by LD50
Wed Dec 11, 2019 7:46 am
Forum: Community Discussion
Topic: OR-80 Overdrive vs OR-120 tone and volume differences?
Replies: 6
Views: 131

Re: OR-80 Overdrive vs OR-120 tone and volume differences?

The circuits of post 73 OR120s and the 80 overdrives are not that different, the MV in the circuit is not the purest type and will always give a little grit and distortion. Personally I would also advise your friend not to pull output tubes on a healthy OR120 (the volume drop is minimal, the cab opt...
by LD50
Sun Dec 01, 2019 8:53 am
Forum: Technical
Topic: OR120 mod
Replies: 25
Views: 4657

Re: OR120 mod

by LD50
Fri Nov 22, 2019 6:54 pm
Forum: Serial Numbers
Topic: 1970 ORST Unhack
Replies: 6
Views: 2432

Re: 1970 ORST Unhack

The stage/studio Drive switch is interesting. The studio has two settings, hard left has the Depth switch in circuit. The second position has the depth switch with a 150pF bypass cap across the volume pot. Position three bypasses the Depth switch and position four is the same but with the 150pF ‘bri...
by LD50
Mon Nov 18, 2019 11:39 pm
Forum: Technical
Topic: OR120 mod
Replies: 25
Views: 4657

Re: OR120 mod

The black Matamps were the GT100s
A friend in Canada put us in touch and I've worked on a few things for him since.
Yes he lives in the US but tours the UK and Europe pretty constantly.
I have schems for most Oranges and the early Matamps.
by LD50
Sun Nov 17, 2019 9:32 pm
Forum: Community Discussion
Topic: ALL GOOD THINGS....
Replies: 41
Views: 2566

Re: ALL GOOD THINGS....

So long......and thanks for all the fish 8)
by LD50
Sun Nov 17, 2019 5:00 pm
Forum: Technical
Topic: OR120 mod
Replies: 25
Views: 4657

Re: OR120 mod

Hi Angelo Funnily enough I have recently been working on Andy's amps. At present he has two 1970 OR100s on tour with him, he is using the original that he bought new in Denmark St (stolen and later returned) and another that Mark is using. I have also just restored an ORST (50w), that is in the unha...
by LD50
Sun Nov 10, 2019 7:06 pm
Forum: Technical
Topic: OR120 mod
Replies: 25
Views: 4657

Re: OR120 mod

Old thread but well worth the discussion :) Some points though. I agree that using a 220k to ground as a voltage divider on the grids is a way of attenuating signal and it was not used on the early Matamps, or the OR series of Orange/Matamps it was used on the Matamp GT100 in the early 70s (which al...
by LD50
Mon Nov 04, 2019 9:57 pm
Forum: Community Discussion
Topic: Do you want to cry a little????
Replies: 9
Views: 2583

Re: Do you want to cry a little????

Well I bid what I thought it was worth bearing in mind have the stuff to restore properly

It went for £735 !!! With no board, transformers, choke, sockets or correct pots :roll:

Hope it does the quality restoration for someone
by LD50
Fri Oct 25, 2019 8:30 pm
Forum: Community Discussion
Topic: Do you want to cry a little????
Replies: 9
Views: 2583

Re: Do you want to cry a little????

Ironically I have all the bits to convert it back, just sad to see.

Price is climbing to a financially non-viable level, but you never know!
by LD50
Fri Oct 25, 2019 8:24 pm
Forum: Community Discussion
Topic: Orange amp problems
Replies: 2
Views: 267

Re: Orange amp problems

The suggestion by Mr Mustard is a good one. Intermittent faults are a pain. Typically open the amp up (taking all the usual precautions re live wires, charged filter caps etc) set it some where safe and stable and play it (or get someone else to) whilst you use a chopstick (non-conductive and severa...
by LD50
Thu Oct 24, 2019 7:07 pm
Forum: Community Discussion
Topic: What year is this 120?
Replies: 2
Views: 271

Re: What year is this 120?

It is probably 72/73. It has the pix only type circuit board (with board mounted preamp valves) The transformers are Parmeko (I believe except the OT is obviously a replacement. 73 more likely as there is no mid-lift inductor and the front panel is pix and letters. the green Plessey mains cans also ...
by LD50
Tue Oct 08, 2019 8:59 pm
Forum: Serial Numbers
Topic: 1970 ORST Unhack
Replies: 6
Views: 2432

Re: 1970 ORST Unhack

Thank you.
I personally think the ORSTs are very versatile amps with the Boost control and filter circuits early in pre-amp. They are like the later Matamps and need to be dialled in.
by LD50
Mon Sep 23, 2019 5:11 pm
Forum: Serial Numbers
Topic: 1970 ORST Unhack
Replies: 6
Views: 2432

1970 ORST Unhack

Presumably made to emulate the cascaded Marshall sound in May 2003, plenty of preamp gain but sounded very noisy, hiss and quite harsh and buzzy with relatively little headroom. Anyone here like to take credit for the work? https://i.imgur.com/Qa0TlIE.jpg https://i.imgur.com/ACs3ZwY.jpg Here are the...
by LD50
Sun Sep 08, 2019 8:40 pm
Forum: Serial Numbers
Topic: Old beast after tidy up (1969 ORST)
Replies: 3
Views: 700

Re: Old beast after tidy up (1969 ORST)

Update The issue was the ground wire from the drive pot was not making good contact with the ground lug on V2. With that sorted everything came good. It is, of course I am biased, fantastic. Very loud, very dynamic, at moderate volumes with boost down a warm clean Orange tone and with the volume and...
by LD50
Fri Sep 06, 2019 7:22 pm
Forum: Serial Numbers
Topic: Old beast after tidy up (1969 ORST)
Replies: 3
Views: 700

Re: Old beast after tidy up (1969 ORST)

Thanks So far I am having oscillation issues when volume is above 2nd notch, up to that point it is, as is usual for these pretty loud and has nice touch dynamics, it is quite a brighter than usual and very loud (with the 1M chassis pot turned up to max - the sound is fatter and more full that way)....