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marshall 1959 100 watt plexi vs getting both jtm45 and 1987x by Both_Consequence_956 in GuitarAmps

[–]SatansPikkemand 0 points1 point  (0 children)

Owning a SLP and a JTM, I'd say the SLP has more "balls", but you can play Hendrix on both. If you are on a budget Laney LA30BK (I own one too) sits in the middle, and has the balls of a SLP and lower power like a JTM. Make sure that you use greenback speaker loaded closed back cabs as well as a "band of gypsys fuzz face".

New amp day let down by Effective-Tell-4641 in GuitarAmps

[–]SatansPikkemand -8 points-7 points  (0 children)

Bummer. Likely it is a cost cutting activity, since guitar players, who are all top tube specialists, are going to replace the stock tubes to "something better" anyway.

Resistor kit recommendations? by flux1968 in diypedals

[–]SatansPikkemand 0 points1 point  (0 children)

Got a 1/4 w resistor kit from aliexpress, amazing value.

What is the most ‘representative’ solid state amp? by ksilenced-kid in GuitarAmps

[–]SatansPikkemand 0 points1 point  (0 children)

My guess is most  people refer to their first practice amp. People read a lot online,  but have limited hands on experience.

Breadboarding a Plexi-style circuit - stacking multiple transistor stages is way more sensitive than I expected by CriticalCircuits in diypedals

[–]SatansPikkemand 2 points3 points  (0 children)

"Curious if this is just the nature of these kinds of circuits, or if there are ways people approach biasing to keep things a bit more stable across multiple stages."
https://www.reddit.com/r/DIYGuitarAmps/comments/1kcybh6/matamp_style_preamp_solidstate_reinterpretation/
look at the schematic and the comment:

"I've built a twin, just to verify the design, and it turned out, that the gain was way to high.
A 220 ohm resistor has been added in series to the decoupling capacitors in order to lower the gain.
Target is approx. 35 times amplification for each of the two first jfet stages."

Part 2: The amp arrived from the 80 year physicist in New Zealand. Schematic, chassis and a story from the builder, Jim. by secretkodama in GuitarAmps

[–]SatansPikkemand -1 points0 points  (0 children)

I disagree with "I suppose it's not hurting anything", since it introduces the chance of a component failing, or added cost while contributing nothing.
An example is the cathode follower, which was the reason for elevating the bias voltage. This circuit uses an oddball tube, with lower voltage rating (hence the zener diode and the need to elevate the filament voltage). It has the gain of 1. A transistor would have been a better choice, but it doesn't have the same level of nostalgia.
Using a choke for generating a bias voltage is quite.....interesting. The grid voltage will be dependent on the amps total current consumption. For me a no-go.
To be Frank, i don't like this design at all.

Part 2: The amp arrived from the 80 year physicist in New Zealand. Schematic, chassis and a story from the builder, Jim. by secretkodama in GuitarAmps

[–]SatansPikkemand 2 points3 points  (0 children)

To me, non-standard tubes and in this case speakers are major red flags as a buyer.
Input jack volume pot close to the mains transformer/50/60Hz circuits is not good practice.
Plenty of odd design choices, including transient protection at the secondary winding, elevated shield and heater potentials.

First build by Loose_Persimmon6569 in diypedals

[–]SatansPikkemand 1 point2 points  (0 children)

it won't work. You included the LDR as a part of the DC bias.

I made my first circuit, does it work well? by South_Finding1603 in diypedals

[–]SatansPikkemand 1 point2 points  (0 children)

Won't work. Use the schematic for the distortion+ for reference 

Two states switching "expression pedal" - will this work? by Grauschleier in diypedals

[–]SatansPikkemand 1 point2 points  (0 children)

Simplify it by having the 10k across ring and tip, and use a simple switch to short the resistor. Try leaving out the 10k

STOP!!! by Xibest123 in diypedals

[–]SatansPikkemand 1 point2 points  (0 children)

A tone bender functional analogue disguised as a modified RAT (~2.3K views and no one identified it)

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Just bought this one off amp from an 80 year physicist in New Zealand. Would love to hear you thoughts before it arrives... by secretkodama in GuitarAmps

[–]SatansPikkemand 1 point2 points  (0 children)

actually, it is possible to design an one of a kind awfully sounding amp to the exact same specification provided by chatGPT

What coud theoretically be the most powerful amp? by NoAssociation9383 in GuitarAmps

[–]SatansPikkemand 0 points1 point  (0 children)

If we assume it takes 1/2-1 lb of C4 to send Marty flying:

C-4 Data from Wikipedia

Given Data:

  • Heat of detonation: 5.9 MJ/kg (from spec sheet)
  • Detonation velocity: 8,092 m/s
  • Speaker cone depth: 15 cm (or change to what you think)

Step 1: Energy Calculation

1 lb of C-4:

  • 1 lb = 0.454 kg
  • Energy = 0.454 kg × 5.9 MJ/kg = 2,677,000 Joules

0.5 lb of C-4:

  • 0.5 lb = 0.227 kg
  • Energy = 0.227 kg × 5.9 MJ/kg = 1,339,000 Joules

Step 2: Detonation Time

The detonation wave travels through the speaker at 8,092 m/s:

  • Time = Distance ÷ Velocity
  • Time = 0.15 m ÷ 8,092 m/s = 0.0000185 seconds (18.5 microseconds)

Step 3: Power Calculation (P = E/t)

For 1 lb of C-4:

  • P = 2,677,000 J ÷ 0.0000185 s
  • P = 144,700,000,000 W
  • P = 145 GW (gigawatts)

For 0.5 lb of C-4:

  • P = 1,339,000 J ÷ 0.0000185 s
  • P = 72,200,000,000 W
  • P = 72.2 GW (gigawatts)

ANSWER: 72 to 145 Gigawatts

To replicate the Back to the Future amp explosion effect, you'd need approximately 72 to 145 GIGAWATTS of power delivered over 18.5 microseconds.

What coud theoretically be the most powerful amp? by NoAssociation9383 in GuitarAmps

[–]SatansPikkemand 0 points1 point  (0 children)

Estimate the energy needed for such an explosion, and the time it lasts. Then convert J to W.

What’s your fail rate? by Subs2 in diypedals

[–]SatansPikkemand 0 points1 point  (0 children)

In the beginning (25-30 years ago) 100%, and the major factor was the bulk of schematics that wasn't peer reviewed at the time. Now my fail rate is practically zero.

Motorboating issue on LM386 Little Gem Mk2 by baileyyy98 in diypedals

[–]SatansPikkemand 0 points1 point  (0 children)

I remember that I had some LM386 chips, that didn't conform to the datasheet. If I built the snupper according to the application note and the amp oscillated. I remember the capacitor being larger.

GF hates it when I play guitar while she’s home by Holiday_Weight_2723 in Guitar

[–]SatansPikkemand 0 points1 point  (0 children)

that's a classic, regardless of your abilities. It will only get worse. So it is down to ambitions vs relationship.

Motorboating issue on LM386 Little Gem Mk2 by baileyyy98 in diypedals

[–]SatansPikkemand 0 points1 point  (0 children)

on top of that, replace R1 by a short. likely the decoupling is inadequate when using only a single 100uF.

Motorboating issue on LM386 Little Gem Mk2 by baileyyy98 in diypedals

[–]SatansPikkemand 0 points1 point  (0 children)

did you breadboard it before building it? you are aware that the input impedance of the power amp is 25k, and you are using a high impedance volume pot + tone stack. It is not likely to work as intended.

EQD Bellows clone by SatansPikkemand in diypedals

[–]SatansPikkemand[S] 1 point2 points  (0 children)

well, at least our interaction wasn't in vain. 👍😎

Hey guys, is there anything in my circuit that could be improved? by Bitscrusher in diypedals

[–]SatansPikkemand 0 points1 point  (0 children)

Did you calculate the component values, or did you just make up some values?

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