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5E3 Input Options

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  • Shawnobi
    replied
    Thanks Richard.
    I wired my scheme up last night and it works a treat. I'll take a look at your suggestion for a future tweak.

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  • Richard
    replied
    If you use an on-on-on switch and reconfigure the wiring you can use both channels at the same time. Connect the input to terminals 1 and 6, the ground to 3 and 4, and the grids to 2 and 5.

    (1) input (2) V1a grid (3) ground
    (4) ground (5) V1b grid (6) input

    I'm pretty sure 1 and 2 are connected and 5 and 6 are connected in the middle position. Double check because there are different types but I think this is the common layout.

    Leave a comment:


  • Shawnobi
    replied
    Ok. So I think I've sussed it if anyone wants to mark my homework!

    This design should give me 2 of the 4 5E3 inputs. Bright Hi & Normal lo.

    For Bright Hi I will see an input resistance of 1M and a grid stopper of 34K. Other channel grounded.

    For Normal Lo switch position I should see an input resistance of 68K and a Grid resistance of 68K forming the voltage divider that attenuates the signal.
    Click image for larger version

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  • Shawnobi
    replied
    Originally posted by mozz View Post
    You're defeating one of the great uses of the 5e3, being able to jumper both channels.
    I know but it's a space issue. I can always add a switch in at a later date or something.

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  • mozz
    replied
    You're defeating one of the great uses of the 5e3, being able to jumper both channels.

    Leave a comment:


  • Steve A.
    replied
    Originally posted by Shawnobi View Post
    Dang. No!
    Both supposed to be highs (Note that the 1M input resistor is still present at the input jack).

    So my input resistance is 1M. But I should be seeing 34k from the grid stoppers for the 'Bright' input, yes? But poss' not with my design because one 68K stopper is grounded??
    So I should be connecting the 'spare' 68K's back onto the input to get the 34K in parallel?
    If following the original schematic you would leave the unused inputs ungrounded. If both channels have a common cathode you can access the "secret" mode by turning up the unused volume control.

    For the Hi input you want a 1M grid load and 34K grid stopper (measure with a DMM if necessary.)

    Steve Ahola

    Leave a comment:


  • Shawnobi
    replied
    Originally posted by Dave H View Post
    The guitar will always be connected to a 'Lo' input. ie. loaded with 136k. Do you really want that?
    Dang. No!
    Both supposed to be highs (Note that the 1M input resistor is still present at the input jack).

    So my input resistance is 1M. But I should be seeing 34k from the grid stoppers for the 'Bright' input, yes? But poss' not with my design because one 68K stopper is grounded??
    So I should be connecting the 'spare' 68K's back onto the input to get the 34K in parallel?
    Last edited by Shawnobi; 05-24-2016, 11:19 AM.

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  • Dave H
    replied
    Originally posted by Shawnobi View Post
    Can anyone see any glaring flaws in my design that I'm missing here?
    The guitar will always be connected to a 'Lo' input. ie. loaded with 136k. Do you really want that?

    Leave a comment:


  • Shawnobi
    replied
    Just dredging up this thread of mine as I've finally built the amp and just finishing the input.

    I've ended up with a single input jack. I've a switch that selects between input 1 on each channel. The other channel is grounded when not selected.

    The other 2 inputs are unused and permanently grounded.

    Can anyone see any glaring flaws in my design that I'm missing here?

    Click image for larger version

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    Last edited by Shawnobi; 05-24-2016, 07:53 AM.

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  • Steve A.
    replied
    [QUOTE=pdf64;418954]See http://music-electronics-forum.com/t30576/ for the arrangement I use.
    I worked out an arrangement so that with 1 regular/mono and 1 stereo switching jack sockets, I could achieve all the above, such that -
    Input A (Normal / Link) - plug into this ONLY to use both channels.
    Input B (Lead) - plug into this to use 'Lead' channel; doing so disables the 'link' function, allowing the channels to be used independently.


    Great idea for a 2 channel amp!

    I... can't see any use for -6dB padded inputs (just turn the guitar tone down a little if additional loading on the pickup is desired).
    I can't remember the last time I plugged my guitar into the Lo input jack (besides jamming with a friend using a single Champ amp back in 1970!) In any case it might come in handy with a line level instrument like a keyboard however it would be easy enough to wire up a dongle for applications like that.

    Click image for larger version

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    Steve Ahola

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  • Shawnobi
    replied
    Originally posted by pdf64 View Post
    Each channel needs a switching jack socket, to avoid hum when nothing is plugged in.
    My arrangement requires the 'B' channel to have a stereo switching socket.
    You can tell I've wired more guitars and pedals than amps, hey?

    Leave a comment:


  • pdf64
    replied
    Originally posted by Shawnobi View Post
    Do the input jacks need to be the type that switch to ground when unplugged?
    Each channel needs a switching jack socket, to avoid hum when nothing is plugged in.
    My arrangement requires the 'B' channel to have a stereo switching socket.

    Leave a comment:


  • Shawnobi
    replied
    Thanks for all of the suggestions. (pdf64 - will have a proper read of that later).

    I was thinking that I could just leave the 2 inputs I wasn't using unwired. Hadn't considered this would inpact the circuit at all. Do the input jacks need to be the type that switch to ground when unplugged?

    Leave a comment:


  • pdf64
    replied
    See http://music-electronics-forum.com/t30576/ for the arrangement I use.
    Apologies to deci belle, I neglected to respond to his last query in that thread.

    Leave a comment:


  • Steve A.
    replied
    I would use the stock 5E3 circuit omitting the two Lo input jacks. (If you really needed to use a Lo input from time to time you could make up an in-line adaptor.) One advantage with this arrangement is that you could put the 33k grid stoppers right on the tube socket with shielded cable going to the jacks.

    Steve Ahola

    P.S. I do like the "hidden mode" on the stock 5E3 but if you are going to split the cathodes I would go for a thicker sound for the Normal channel.

    Leave a comment:

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