Search found 99 matches

by Optical
15 Sep 2020, 21:50
Forum: Amplifiers
Topic: power amp for Eleven Rack?
Replies: 6
Views: 226

Re: power amp for Eleven Rack?

I had an elevenrack a while back. It sounds reasonable with either a solid state or tube power amp. There are power amp types you can switch in the settings to fiddle with the response. Overall I thought it sounded a bit average however. The ADC and DACs were good though so it's a quality interface....
by Optical
12 Aug 2020, 02:20
Forum: Amplifiers
Topic: Suhr Reactive Load [schematic]
Replies: 35
Views: 2859

Re: Suhr Reactive Load [schematic]

I figured - thanks.
I'm wondering if the enclosure might affect the inductance of those coils, the bass resonance models to quite a high frequency. Are you able to test whether the inductor values change when the enclosure is assembled?
by Optical
11 Aug 2020, 22:41
Forum: Amplifiers
Topic: Suhr Reactive Load [schematic]
Replies: 35
Views: 2859

Re: Suhr Reactive Load [schematic]

Here's the schematic. Values for the inductors were measured with my Atlas LCR. They match close to off-the-shelf values for speaker crossover inductors. Should be an easy DIY if you're interested. The isolated grounding is smart and works well. Can't speak to whether it would sound better with a p...
by Optical
01 Aug 2020, 23:17
Forum: Amplifiers
Topic: Suhr Reactive Load [schematic]
Replies: 35
Views: 2859

Re: Suhr Reactive Load [schematic]

I explicitly said the amp should also be plugged into a load. To be clear, plugged into speaker cab, and an interface at the same time, the cab being the load. Just another way to skin a cat - the load the amp sees is perfect, and the DI signal captured can have an IR applied and the end result is r...
by Optical
30 Jul 2020, 23:24
Forum: Amplifiers
Topic: Suhr Reactive Load [schematic]
Replies: 35
Views: 2859

Re: Suhr Reactive Load [schematic]

You dont agree? the input impedance is high enough to not affect it. Most amp DI outputs are just dividers from the output transformer.
by Optical
28 Jul 2020, 00:49
Forum: Amplifiers
Topic: Suhr Reactive Load [schematic]
Replies: 35
Views: 2859

Re: Suhr Reactive Load [schematic]

If the amp is low power you can run a speaker output direct to your interface (as long as it's plugged into a load as well of course)
by Optical
15 Jul 2020, 22:51
Forum: Amplifiers
Topic: Suhr Reactive Load [schematic]
Replies: 35
Views: 2859

Re: Suhr Reactive Load [schematic]

Nice one, will look forward to that
by Optical
15 Jul 2020, 09:25
Forum: Amplifiers
Topic: Suhr Reactive Load [schematic]
Replies: 35
Views: 2859

Re: Suhr Reactive Load [schematic]

Ive seen in that before and it looked to be a direct implementation of the Aitken circuit.
Are you able to confirm the other values? L of the coils if possible, and the caps?
by Optical
27 Jun 2020, 06:21
Forum: Pedal Debugging & Troubleshooting Support
Topic: Buffer adding hisssssssss
Replies: 10
Views: 568

Re: Buffer adding hisssssssss

What kind of hiss do you experience? Can you measure it's frequency? What type of IC/charge pump you've used for 30v conversion? Is there any power line ripple (switching noise). If it's switching noise, LC filter would work way better than RC. But in some cases it could be defective power IC (I've...
by Optical
27 Jun 2020, 06:06
Forum: Pedal Debugging & Troubleshooting Support
Topic: Buffer adding hisssssssss
Replies: 10
Views: 568

Re: Buffer adding hisssssssss

Why a charge pump for a buffer? If you wanted lots of clean boost I would understand, but buffering means gain around 1, so unless you are buffering a signal already close to 30v(!) that is wasted headroom and parts and power and... an invitation for trouble... Maybe it's part of something bigger? ...
by Optical
26 Jun 2020, 01:52
Forum: Pedal Debugging & Troubleshooting Support
Topic: Buffer adding hisssssssss
Replies: 10
Views: 568

Re: Buffer adding hisssssssss

RC filter on the power supply? I'll try that, thanks
The ground paths for the audio and power circuits are separated and joined only at one location (input jack)
by Optical
26 Jun 2020, 00:16
Forum: Pedal Debugging & Troubleshooting Support
Topic: Buffer adding hisssssssss
Replies: 10
Views: 568

Buffer adding hisssssssss

I built a buffer using a TL071 (standard non inverting) and a charge pump for 30V. It does the job, but adds a lot of hiss ive noticed. The noise floor is quite high now - at band volumes you have to shout over the hiss to give an idea of how loud it is. Before I go blindly swapping in other types o...
by Optical
22 May 2020, 05:39
Forum: Electric Guitar Rewiring
Topic: Bass cut = high pass filter question
Replies: 8
Views: 897

Re: Bass cut = high pass filter question

Your amp or pedals also have a resistor to ground on the input, usually 1M. So a series output cap forms a highpass filter when combined with the amp input resistor. Read up on "RC filters" Can calculate the cutoff frequency using the formula 1/2.pi.R.C, or just use an online calculator and input yo...
by Optical
12 May 2020, 22:13
Forum: Amplifiers
Topic: How to improve tube amplifier tone by changing one part
Replies: 101
Views: 7914

Re: How to improve tube amplifier tone by changing one part

Also, if you can hear it, then you can definitely measure it. So swapping caps and doing some frequency spectrum analysis should clearly show up differences.
by Optical
12 May 2020, 02:17
Forum: Pedal Debugging & Troubleshooting Support
Topic: Nux looper core pedal malfunctioning
Replies: 8
Views: 776

Re: Nux looper core pedal malfunctioning

possibly a dry or broken solder joint around the jacks or volume pots
by Optical
23 Feb 2020, 20:53
Forum: Ready-To-Build Effect Projects
Topic: BAJA REACTOR 010119 [verified]
Replies: 46
Views: 3971

Re: BAJA REACTOR 010119 [verified]

Ive just built this using one of Bajamans pcbs. Have to say, it works really well. I was trying a tube preamp into a solid state power amp, and it had no mojo. But with this reactor circuit, mojo restored and the result is similar to using a tube power amp. Impressed/10 I tried some various diodes b...
by Optical
17 Feb 2020, 05:20
Forum: DIY Stompbox designs
Topic: The Orange sound ...
Replies: 8
Views: 4055

Re: The Orange sound ...

I saw this circuit floating around for a bax stack with semi parametric mids

Image
by Optical
17 Feb 2020, 05:17
Forum: DIY Stompbox designs
Topic: The Orange sound ...
Replies: 8
Views: 4055

Re: The Orange sound ...

Bump for Orange love
Has anyone played around with the CR120 circuit some more or investigated the bax Bangeetar?
by Optical
04 Feb 2020, 21:19
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Barcus-Berry Standard Pre-Amp Model 1330-1 [schematic]
Replies: 60
Views: 8792

Re: Barcus-Berry Standard Pre-Amp Model 1330-1 [schematic]

Putting the EQ into the feedback loop is quite interesting.
I havent seen many other other designs like this but the TC integrated preamp springs to mind
by Optical
19 Nov 2019, 20:50
Forum: Boutique Stompboxes dissected...
Topic: EQD - Disaster Transport JR [traced]
Replies: 10
Views: 6458

Re: EQD - Disaster Transport JR [traced]

For wet only, disconnect R9