Binson e4t feedback

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

Hi guys,
my english is bad so I bounce presentation and my sentences will be short and some time these last could be strange.. I beg your pardon for this...
I have a echorec binson e4t (I attach the schematic). If I increase "length" (feedback) I have only max 4/5 repeat even if I put on max the internal trimmer.
how can I try to edit in the feedback circuit for add the number of repeat?
thank you and excuse me for errors and ignorance
Luca
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OC26
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Post by OC26 »

The number of repeats is based upon the number of playback heads, four in this case. (?)

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lukehead
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Post by lukehead »

no, the heads causes the delay time...the time of your repeat is greater when you put on the last head, the time of your repeat is more little when you put on first head..
the feedback is determinate from quantity of gain who the signal is bring back (signal bring back=1 feedback infinity)

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lukehead
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Post by lukehead »

there it is
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OC26
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Post by OC26 »

lukehead wrote: 05 Jan 2021, 10:49there it is
This is the delay general concept. With multiple heads things are not exactly the same... In a tape echo you can change the amount of delay increasing or decreasing the tape speed and/or the distance between record and playback heads. Feedback causes increasing the number of repeats and the sound “tail”. OK. But why use only one playback head if you have four?

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lukehead
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Post by lukehead »

sorry...I don't get it...my issue is number of repeat (feedback through circuit), isn't time between repeat (it get through on/off heads)

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OC26
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Post by OC26 »

I think this was an interesting question. Does anybody lend a hand to lukehead?

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lukehead
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Post by lukehead »

do nobody know to tell anything?

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Manfred
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Post by Manfred »

I would say that the number of repeats depends on the level of the feedback signal.
This would have to be increased by increasing the gain of the feedback stage or the amount of feedback signal in the mixer circuit.
The schematic is difficult to read as there are very few annotations on the components.

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lukehead
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Post by lukehead »

Perfect Manfred...you are on my own position...now would be necessary to know where there is this gain...this was my question..

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Manfred
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Post by Manfred »

I found the following circuit diagram of the ECOREC 2 in tube technology in which some is noted.
I think its circuit structure was probably transferred to the semiconductor version.
I will have a look at it.
BinsonEcorec2_1.jpg

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lukehead
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Post by lukehead »

yes..I think that the concept is the same...

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