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  1. There are several commercial options available....

    There are several commercial options available. Another is the Radial Tonebone: https://www.radialeng.com/product/headbone-vt
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    The simple answer: With the switch open, R27...

    The simple answer:

    With the switch open, R27 is effectively out of the circuit and the resistance between the upper and lower part will be that if R26.

    With the switch closed, the resistance...
  3. If you use safety resistors, both types are OK. ...

    If you use safety resistors, both types are OK.

    Make sure to have the safety resistor on the switchbox though, not just amps. Sooner or later someone will plug in an amp without safety...
  4. Correct, the safety resistor goes between the tip...

    Correct, the safety resistor goes between the tip and ground of the speaker jack.

    If you have multiple parallell jacks then one resistor is enough. If you have different jacks for different...
  5. The safety resistor idea comes from Kevin...

    The safety resistor idea comes from Kevin OíConnorís books. He wrote somewhere that he had never seen an amp damaged by a mismatched load (wrong speaker impedance), but he had seen dozens of amps...
  6. The main thing to be careful about when switching...

    The main thing to be careful about when switching speakers is to avoid intermittent load, which can cause voltage spikes and destroy the output transformer.

    Even if the unused amp is switched to...
  7. Thread: The Lion Tamer

    by d95err
    Replies
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    All this because of Fenderís epic design fail -...

    All this because of Fenderís epic design fail - using a linear taper master volume pot...
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    Badly designed fx loops is probably the main...

    Badly designed fx loops is probably the main reason they are sometimes frowned upon. Most common design flaw is putting the loop after the master volume. This results in too low loop levels (high...
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    Going back to the fx loop discussion, I think...

    Going back to the fx loop discussion, I think delay is the most obvious example. It is almost impossible to get a subtle delay effect if you run it before a heavily distorting amp or pedal. The...
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    I like to put a safety resistor of 200 to 1k...

    I like to put a safety resistor of 200 to 1k directly across the OT secondary wires. That way, Iím safe in case if failures or intermittent connections for the jacks, impedance switch or anything...
  11. In the old days, before intentional distortion,...

    In the old days, before intentional distortion, gutar amps were designed to reproduce the sound of the guitar as accurately as possible. Many amps were designed to be multi-purpose (guitar, vocals,...
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    It sounds like youíre describing the topology of...

    It sounds like youíre describing the topology of a Dumble Overdrive Special. I would start from there and experiment. If you want to add a Dumble-style overdrive section to an AB768 style amp, I...
  13. To me, having the master volume before the loop...

    To me, having the master volume before the loop is a really bad idea, as the loop level will depend on how loud you set the amp. Play at low volume and the loop level will be so low, the...
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    Cool to have a separate phase inverter for each...

    Cool to have a separate phase inverter for each channel, but I don't understand why? The differences between the two PIs is minimal and it would have been easy to save a tube by simply switching MV...
  15. Not really. The Chupacabra is a high-gain amp in...

    Not really. The Chupacabra is a high-gain amp in sthe style of Jose, Friedman and so on. It is designed mainly for preamp distortion, not poweramp crunch.


    My suggestion:

    Replace the current...
  16. In general, effect loops should always be before...

    In general, effect loops should always be before the master volume. Otherwise, the master volume will affect the loop signal level, resulting in poor signal-to-noise ratio unless the master volume is...
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    Don't know any 6V6 models, sorry! However,...

    Don't know any 6V6 models, sorry!
    However, simulations have limited value for designing something as simple as a SE output stage. I think you are better off building it and experimenting, going by...
  18. Thread: DIY attenuator

    by d95err
    Replies
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    3,861

    I agree that attenuators are useful for taming a...

    I agree that attenuators are useful for taming a high-powered amp for stage and practice volumes, but not really for "bedroom" levels.

    For home use, I have a reactive dummy load (a Weber Mass...
  19. When discussing the evolution of guitar amps I...

    When discussing the evolution of guitar amps I think we must keep in mind that in most cases, the primary design goal was cost. Engineers had to deliver sufficient output volume at as low cost as...
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    There's a 1000p bright cap on the gain pot....

    There's a 1000p bright cap on the gain pot. Turning it down more than a fraction below max will most likely result in extremely thin, harsh and unusable tones.

    I just can't figure out why amp...
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    Can't see any reason for C5 and R21 either. Could...

    Can't see any reason for C5 and R21 either. Could this be a leftover from a previous version of the design that accidentally got left in?
  22. I haven't built one myself, but judging by...

    I haven't built one myself, but judging by discussions on the forum and the many common mods for the 5e3 PI stage (e.g. grid stopper, biasing), it seems it has a rather big effect on the tone and...
  23. Regarding the tone controls - you could use dual...

    Regarding the tone controls - you could use dual (stereo) pots and have two parallell tone circuits. You could then use a simple DPDT to switch between the two circuits. These two circuits would be...
  24. An optional topology would be to use a FET (e.g....

    An optional topology would be to use a FET (e.g. LND150) as the first stage and use a tube stage for the splitter.
  25. Image is not showing properly. It says "please...

    Image is not showing properly. It says "please update your account to enable 3rd party hosting".
  26. Thread: The Vibro-Wreck

    by d95err
    Replies
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    2,083

    One more thing - I would recommend deriving the...

    One more thing - I would recommend deriving the heater elevation reference voltage from the second (B) or third (C) power supply node. The first node (A) is a very "dirty" voltage, so it's better to...
  27. Thread: The Vibro-Wreck

    by d95err
    Replies
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    2,083

    The master volume is wired "backwards" on the...

    The master volume is wired "backwards" on the schematic. You should wire them as a normal volume pot. The wiper should connect to R35/R36 and the top of the pots to C17/C18.
  28. For a gain control, this behavior can be...

    For a gain control, this behavior can be desirable. Fat for clean sounds, tight distortion when you turn it up.

    Incidentally, this is the opposite of the common "bright" cap used on so many amps,...
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