Search found 969 matches

by phatt
Yesterday, 13:12
Forum: Amplifiers
Topic: Suhr Reactive Load build with Attenuator
Replies: 20
Views: 559

Re: Suhr Reactive Load build with Attenuator

Hi xbearxau, Can one assume the Spk Protect is only for the SS follower? Another Query, I take it you have an original UA unit and you are going to compare this with the UA when finished? The UA with its 30R load concept is very good, I use a similar setup. But this unit you are building is Reactive...
by phatt
14 Jan 2021, 07:08
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Rockman X100 - Make it a DIY Pedal
Replies: 135
Views: 9900

Re: Rockman X100 - Make it a DIY Pedal

Rotary sw maybe?
https://www.jaycar.com.au/2-pole-sealed ... y/p/SR1212
Can be preset for 2 pole 2 position to 2 pole 6 position.
I have used these in several builds and work well.
Phil.
by phatt
04 Dec 2020, 13:57
Forum: Amplifiers
Topic: Small Push Pull tube amp build, advice sought.
Replies: 27
Views: 1260

Re: Small Push Pull tube amp build, advice sought.

Hey Fred,, I'm still bench testing a circuit using my ideas mixed with a few others and so far it's working well. Preamp is slightly modified Clean/Crunch channel of the SLO, Into my Modified HiWatt tone stack then into a PP 6V6. I Don't need or want the Lead as it's too much for my styles so only 2...
by phatt
04 Dec 2020, 13:23
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Rockman X100 - Make it a DIY Pedal
Replies: 135
Views: 9900

Re: Rockman X100 - Make it a DIY Pedal

I Just noted that the above schematic (as well as the original) has no ground reference? :scratch: As I understand it pin 3 needs a path to Common to work,, but I could be wrong [smilie=a_whyme.gif] I don't know about the Rockman circuit but my old Nobels unit which is similar to this one had a 68k ...
by phatt
29 Nov 2020, 13:50
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Rockman X100 - Make it a DIY Pedal
Replies: 135
Views: 9900

Re: Rockman X100 - Make it a DIY Pedal

Am I correct here? Is this how the circuit looks on Clean 1 before it hits EQ-1? Looks good to me, nothing like a highlight colour to follow the signal path. Good on you :thumbsup Phil. So basically Clean 1 before it hits the cab sim is just a Compressor with an input Buffer right? Its basically re...
by phatt
29 Nov 2020, 13:42
Forum: Amplifiers
Topic: Small Push Pull tube amp build, advice sought.
Replies: 27
Views: 1260

Re: Small Push Pull tube amp build, advice sought.

I need a bit of advice and guidance from the valve (tube) gurus. Specs from Partridge datasheet P4131 8k a-a 43% taps max 10W P4133 8-9k a-a, 20% taps max 8W Q2. As as far as I can remember none of the guitar amps I have worked on have used screen grid taps, should I just ignore these and use scree...
by phatt
29 Nov 2020, 10:37
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Rockman X100 - Make it a DIY Pedal
Replies: 135
Views: 9900

Re: Rockman X100 - Make it a DIY Pedal

Carvindc125 wrote: 29 Nov 2020, 05:12 Am I correct here? Is this how the circuit looks on Clean 1 before it hits EQ-1?
Looks good to me, nothing like a highlight colour to follow the signal path.
Good on you :thumbsup
Phil.
by phatt
27 Nov 2020, 07:24
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Rockman X100 - Make it a DIY Pedal
Replies: 135
Views: 9900

Re: Rockman X100 - Make it a DIY Pedal

I am looking at the full schematic and admittedly I am not used to looking at a schematic drawn in this way. The switches and routing to them is throwing me off and confusing me. Is there anyway someone could be an amazing over achiever and Draw the schematic in sections like the edge, dst, and EQ1...
by phatt
24 Nov 2020, 07:28
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Rockman X100 - Make it a DIY Pedal
Replies: 135
Views: 9900

Re: Rockman X100 - Make it a DIY Pedal

Also is there a complete schematic on the distortion section including where +6 and -6 is hooked up? the Full Schematic is on the very first post. :wink: Re the SST1 mockman it's close to the same,, as noted here by *Jarrod* he thought he needed more hi freq but ultimately found it was not needed. ...
by phatt
21 Nov 2020, 13:52
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Topic: How to Convert single supply voltage circuit to Dual +/- voltage supply???
Replies: 10
Views: 650

Re: Topic: How to Convert single supply voltage circuit to Dual +/- voltage supply???

Thanks Johan, Wired up like you said for dual voltage supply, the preamp works to some effect as it should, aside from one fault. The Volume control now seems to only find its maximum gain in the centre position, dial up or down from there and it just cuts the volume, must be something to do with t...
by phatt
17 Nov 2020, 05:45
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Rockman X100 - Make it a DIY Pedal
Replies: 135
Views: 9900

Re: Rockman X100 - Make it a DIY Pedal

Hi Jarrod, Regards the 6n8 cap setting. Bare in mind C103 (1nF) rips of a massive amount of bass on the standard circuit,, as you do need to wipe a lot of lows when using heavy dirt,,,but if you lower C112 the bass loss is now way too much so if you raise C103 up to ~10nF that may help to balance th...
by phatt
13 Nov 2020, 14:19
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Rockman X100 - Make it a DIY Pedal
Replies: 135
Views: 9900

Re: Rockman X100 - Make it a DIY Pedal

Maybe check your pins are correct against the data sheet,, as they are different to LM78xx series.
Great playing BTW :thumbsup and yeah,, close enough I'd stop tweaking for more top end as that will likely make it worse .
Phil.
by phatt
09 Nov 2020, 14:07
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Rockman X100 - Make it a DIY Pedal
Replies: 135
Views: 9900

Re: Rockman X100 - Make it a DIY Pedal

Hey Jarrod, Just my observations,, Change C112 from 12n down to 2n2 or similar that will flatten the mid hump. Don't try grabbing more top end in this circuit,, You would be far better off hanging a tone stack on the end. Also I agree with Mr BMXguitar the compressor is likely not that great so inse...
by phatt
02 Nov 2020, 11:30
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Rockman X100 - Make it a DIY Pedal
Replies: 135
Views: 9900

Re: Rockman X100 - Make it a DIY Pedal

I just did a quick sim of the response curves from R112A.
C112 (12nF) gives the mid hump,, lower values will flatten that out if needed.
Phil.
by phatt
02 Nov 2020, 08:42
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Rockman X100 - Make it a DIY Pedal
Replies: 135
Views: 9900

Re: Rockman X100 - Make it a DIY Pedal

Perhaps I am getting ahead of myself but..... maybe good to add some control of the compression (which I always thought was rather high in the Rockman), would adding a pot like this (see red outline in schema) adjust the speed/attack of the compressor? And, if we wanted to add a threshold pot? Wher...
by phatt
11 Oct 2020, 08:22
Forum: Amplifiers
Topic: 6V6 Mystery Amp
Replies: 21
Views: 1862

Re: 6V6 Mystery Amp

Regards this; Still has splatty distortion when cranked, but I've learned enough recently from my experiments on the Traynor (and Merlin's excellent book), that this is easily overcome with making good choices in the preamp. With no grid stoppers it's a fair bet it will splatt I'd be inserting Grid ...
by phatt
11 Oct 2020, 05:25
Forum: Amplifiers
Topic: amp differences
Replies: 5
Views: 1463

Re: amp differences

what makes amps sound so incredibly different? what makes a mesa break up so starkly differently from a fender? Simple answer, Extra gain stages. (as mentioned) It's a common Q, What's the "main" difference between Marshall and Fender amps? I would Answer, Power Valves first. Just reading...
by phatt
10 Oct 2020, 22:24
Forum: Amplifiers
Topic: Laney LC50 Mk1 and Mk2 - B+ dropping resistor
Replies: 6
Views: 540

Re: Laney LC50 Mk1 and Mk2 - B+ dropping resistor

If the the unmentioned problem is not related to this part and there is no evidence of overheating and the amp has been running for years like that,, then it's fine. 3Watt is a common value at that point as it's only driving the preamps. 10k,,12k nah close enough for a guitar amp,,,leave it,, you wi...
by phatt
18 Sep 2020, 12:49
Forum: Amplifiers
Topic: Suhr Reactive Load [schematic]
Replies: 71
Views: 7086

Re: Suhr Reactive Load [schematic]

Interesting quirk, Eons ago I built something similar. Sort of a loadbox come attenuator / line out. I rectified the signal to drive a fan and have never noticed the symptoms you describe. I used a full wave bridge and cap to store some energy,, maybe that helps? If you want I can pop the lid, Circu...
by phatt
12 Sep 2020, 02:10
Forum: DIY Stompbox designs
Topic: XR2206 Tremolo/Vibe/Leslie circuit
Replies: 7
Views: 2135

Re: XR2206 Tremolo/Vibe/Leslie circuit

LessLee update; Removed C12, C17 & R19. (Was no need for the Caps) Added R26 4k7 across VR2. Max resistance is now ~3k. Unlikely to find a 3k pot so a 10k with 4k7 gives a good balance. R23 up to 47k. (needed to reduce clock noise bleed through) Note Q1 supply must be taken before R25 otherwise ...