Search found 255 matches

by Optical
Mon Mar 18, 2024 10:01 am
Forum: Amp Talk
Topic: My Marshall JMP 1987 clone. Sound clip. The Unchained Riff (of course).
Replies: 14
Views: 418

Re: My Marshall JMP 1987 clone. Sound clip. The Unchained Riff (of course).

The Marshall studio amps dont have any of the London power scaling circuitry in them.
They just run a low plate voltage on the power tubes and a second power supply for regular voltages on the preamp.
by Optical
Wed Feb 07, 2024 8:24 am
Forum: DIY - BUILD YOUR OWN Amps
Topic: Where to get components locally
Replies: 28
Views: 2929

Re: Where to get components locally

There must be a reason they use 160v or greater. I just trawled TradeMe looking for one. No joy. They used that cap because the same cap was used in other amps Marshall were building at the time and they like simplifying their inventory. It's not for safety, sound or any other reason. Also that is ...
by Optical
Wed Jan 10, 2024 2:47 pm
Forum: DIY - BUILD YOUR OWN Amps
Topic: Test driving the mini JCM800 from Elams
Replies: 11
Views: 70130

Re: Test driving the mini JCM800 from Elams

I love Elam's videos, so zen watching a closeup of a saw cutting something haha
by Optical
Wed Jan 10, 2024 2:46 pm
Forum: Show us yer gear
Topic: NAD - Mesa Mark III Green Stripe
Replies: 30
Views: 95852

Re: NAD - Mesa Mark III Green Stripe

Man 7 years ago, where does the time go... Yeah was a good score alright. Wish I'd bought back a bunch more! That's awesome man. That'll be me this coming May haha. Are you there for a business trip or just a holiday? I used to pack up my office and work in another country for a month or two each ye...
by Optical
Wed Jan 10, 2024 1:19 pm
Forum: DIY BUILD YOUR OWN - Pedals
Topic: Anyone want to have a crack at repairing an in-ear monitor?
Replies: 16
Views: 145404

Re: Anyone want to have a crack at repairing an in-ear monitor?

Can you actually get into the electronics/circuit board?
by Optical
Wed Oct 11, 2023 8:17 pm
Forum: Guitars
Topic: Pedalboard tone suckage woes
Replies: 26
Views: 9388

Re: Pedalboard tone suckage woes

How long are these leads? could just be too much, or possibly lead 2 is faulty as mentioned
by Optical
Tue Jul 11, 2023 8:56 am
Forum: DIY - BUILD YOUR OWN Amps
Topic: Amp switching box
Replies: 5
Views: 3933

Re: Amp switching box

Good work - but as noted those little rotary switches cant handle the current on one pin, and a second issue is those pins don't always make stable electrical connections. Any vibration or maybe even temperature change might cause a momentary bad connection. The issue isnt so much burning out the sw...
by Optical
Fri Jul 07, 2023 11:44 am
Forum: DIY - BUILD YOUR OWN Amps
Topic: Calculating slotted port size in 2x12?
Replies: 22
Views: 8897

Re: Calculating slotted port size in 2x12?

The Z best cab has a lot of low end - more than a 4x12. Couldnt hurt to make the port size adjustable - there are lots of bass reflex cab design simulators around, the principle is extending the low frequency response using a port tuned to an optimised frequency
by Optical
Tue May 16, 2023 1:30 pm
Forum: DIY - BUILD YOUR OWN Amps
Topic: Marshmallow's 3w Amp
Replies: 9
Views: 4731

Re: Marshmallow's 3w Amp

Nice man. What output transformer have you selected?
by Optical
Thu May 11, 2023 10:03 pm
Forum: DIY BUILD YOUR OWN - Pedals
Topic: Swapping Case. Rewire Footswitch? How?
Replies: 26
Views: 7552

Re: Swapping Case. Rewire Footswitch? How?

You can make a toggle switch act like a momentary one using capacitive coupling. Look up toggle to momentary switch circuits Why overcomplicate things? It would be easier just to get one of these. https://www.hotroxuk.com/media/catalog/product/cache/01e4e7eb64437ec9d9c97e3c19491fe2/p/-/p-h604.jpg y...
by Optical
Thu May 11, 2023 4:35 pm
Forum: DIY BUILD YOUR OWN - Pedals
Topic: Swapping Case. Rewire Footswitch? How?
Replies: 26
Views: 7552

Re: Swapping Case. Rewire Footswitch? How?

You can make a toggle switch act like a momentary one using capacitive coupling. Look up toggle to momentary switch circuits
by Optical
Mon May 01, 2023 4:05 pm
Forum: Guitar Mods
Topic: Refret, what guage?
Replies: 5
Views: 5622

Re: Refret, what guage?

Only downside to jumbos is sometimes if you press the string down hard enough it can pull the note sharp
6100 is (or is close to) what Charvel uses, I like those.
by Optical
Mon Apr 17, 2023 4:43 pm
Forum: DIY - BUILD YOUR OWN Amps
Topic: How to get more reverb out of this circuit?
Replies: 2
Views: 3526

Re: How to get more reverb out of this circuit?

I'd try these things which will change gain but not frequency response: 1 - Pop a 22uF cap over the cathode resistor of the recovery stage, that will quickly tell you whether more recovery gain will do the trick or if it distorts. If it does distort, but gets close to the volume you want, you can ch...
by Optical
Tue Mar 28, 2023 11:57 am
Forum: Amp Talk
Topic: JCM900 4102 opinions?
Replies: 52
Views: 9501

Re: JCM900 4102 opinions?

I've seen lots of 900s in use live, but it's usually a plug a pedal board into the fx return setup. Cant recall ever seeing someone use the preamp?
by Optical
Tue Mar 28, 2023 10:16 am
Forum: Amp Talk
Topic: JCM900 4102 opinions?
Replies: 52
Views: 9501

Re: JCM900 4102 opinions?

Come round to my place if you want to hear it for yourself. Play the 900 against a 800, 2000, Jose' and friedman and you'll be pretty clear on where it stands in the marshall tone lineup