Klemt Echolette M100 tube amp

Discussion regarding early stompbox technology: 1960-1975 Please keep discussion focused and contribute what info you have...
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snk
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Post by snk »

Hello,
[ I don't know if this thread belong to here (this is not a stompbox, but musicians like to use these amps like effects), so if not, mods please feel free to move it ]

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I recently got a Klemt Echolette M100, but i am not sure how I should connect the output, and i wouldn't like to make a mistake : I want to use it as an effect (like a regular rack or pedal effect), not like a power amp with speakers.
I can't find the service manual, nor the operation manual for it...

Should I use the phone out din plug on the front for that usage ?
Can i safely use it without speakers (i have read on GS some people assume that it wasn't advised to do so) ?
Is there any way to use the jack sockets on the back to connect to a mixer desk instead of speakers (with impedance matching) ?


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Zokk
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Post by Zokk »

Hi
it seem the front DIN has an output for the mixer section, but could be used as insert (send return).
If I am right you could have your mixer output at a reasonable level, on pin 4, but the signal will still be hot for your amp input (11mV).
The other output on the back is a tape recorder connection, in and out, but the signal is hotter than on the front DIN.

The master volume control is post line out, which means you won't have a master pot for your mix, but you may be able to use this mixer without a load on the power amp output just by setting the volume to zero.

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snk
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Post by snk »

Thank you, ZOkk.
Is there a reason why i shouldn't use it withot speakers ?

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deltafred
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Post by deltafred »

It has solid a state output stage so will be fine to run without speakers.

Even though it has an output transformer it has a very different output stage to a tube amp.
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snk
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Post by snk »

Thank you, DeltaFred.

One last question: If i wanted to use the main outputs (speakers), what kind of device should i use it with, to insert between the M100 and a mixer desk ?
Something like a impedance matcher, does it exist for such a use ? Like a DI box, but to insert between a power amp and a mixer desk...

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Post by uncleboko »

I knew a guitarist in the Barnet area of North London around 1964-65 who used Echolette echo with an Echolette amp, and could play much Chet Atkins stuff - including Lullaby of Birdland!!

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snk
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Post by snk »

The Echolette Echo is quite incredible indeed. You can't adjust the delay times, but the tone is quite unique.

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Post by Zokk »

snk wrote: If i wanted to use the main outputs (speakers), what kind of device should i use it with, to insert between the M100 and a mixer desk ?
Something like a impedance matcher, does it exist for such a use ? Like a DI box, but to insert between a power amp and a mixer desk...
A good old powersoak lets you plus a small amp into a mixer, and even headphones.
Otherwise most DI boxes can be placed post poweramp.

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Post by snk »

A DI Box ? i suspected it might do the trick, but i wasn't sure... :thumbsup
What is a "powersoak " ?

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Post by Zokk »

You can find several DI boxes which allow direct plug in the poweramp output, such as this one for example:
http://www.radialeng.com/product/jdx-48

The Powersoak is an old power dissipator, simple resistor network, I still use it occasionaly to record straight from a Bassman head without speakers to not disturb the kids late at night 8)
https://www.rockman.fr/Reviews/Power_Soak.htm

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snk
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Post by snk »

Thank you, Zokk.
Do you know any such DI box available as a DIY project ?

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Post by phatt »

It's a SS output and does not need a load resistor,, all you need is a 10/1 ~ 20/1 voltage divider say a 100k series Resistor and a 10~20k pot and you have a variable line out. Actual resistance is not critical as long as it has 10~20/1 division.
220k
-/\/\/\/-
/
\ 10k
/<-----Line out
\
/
Com
Phil.

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Post by snk »

Wonderful !
Thank you, Phil :thumbsup

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Post by phatt »

snk wrote:Wonderful !
Thank you, Phil :thumbsup
Cool ,, just note the pot goes After the 220k resistor. It did not post the way I typed it. :slap:
So speaker output connects to left of 220K and top of pot goes to right then pot to ground.
Phil.

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Post by snk »

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Just like that ?

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Post by phatt »

Nope,, this is what you need;
simple line out.png
Phil.

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Post by snk »

Perfect ! Thank you, Phil :thumbsup

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Post by snk »

Hello,
I just found the time to drill an enclosure for it, and i was going to build the circuit, but i realized the pot is marked as 10K log : is it mandatory ?
I mean :
- will a low value (like 10K) have any incidence on the sound and roll the treble off (as opposed to something like 500K), or is it applicable only in other kind of circuits ?
- I checked, and i have only 50KA, 100KA and 500KA pots... Should I better order a 10KA pot, or should i adjust the resistor accordingly, in order to keep a 10/1 ~ 20/1 ratio ?

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Post by snk »

For instance, if i use a 100KA pot (i have plenty of them), i may use a 1M-2.2M resistor, that's it ?
Is there any advantage in using a 100K pot over a 10K ?

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