Bleedthrough on the manuals when one pedal drawbar is pulled

[freiburg]

Just like to know if the following is normal behaviour or not:

All drawbars in, choose Bb preset on the lower manual, press a chord, pull out one of the two pedal drawbars. On my organ I have bleedtrough from all drawbars. it gets louder when I pull one pedal drawbar further out. it vanishes, as soon as the second pedal drawbar is pulled out.

Regards
Christian

[Wes]

I don't have any experience with consoles, but the first thing I would check is TG grounds including the screws for the metal plate in the TG.

[geoelectro]

Also the grounds on the preset panel.

Geo

[Guest]

Look for shorts or cracked wiring on the rear of the manuals and drawbars especially in that hinged box. If you are getting crosstalk then there has to be a short and as wes and geo said the grnd plane is the first place to look.

[freiburg]

Thanks guys

I will take a look at this.

Christian

[indianajo]

The grounds on the preset panel are the black ones on the bottom. Unscrewing and rescrewing them should help.

[MihevicB3]

I checked all the grounds on my B3 and even added hard external hardwire grounds to the TG, TG metal plate and the preset panel. This how my B3 behaves:

- Need to have volume pedal at maximum
- All lower manual drawbars set a “0” (pushed in)
- Either the lower manual Bb or B preset depressed
- Play a 4 note chord
- With both pedal drawbars in or at any identical setting (even 88) there is no bleed through at all.
- The bleed through starts to occur when the 16’ or 8’ pedal DB’s are at different settings and is the worst when the setting is 80 or 08.
- With my PR-40 it is difficult to detect any bleed through at all. However, I can hear it through my 122 Leslie
- NOTE: There is no bleed through on the upper manual with the pedal drawbars. This is probably because the pedal DB’s go to the lower manual matching transformer.

John M.

P.S. I would appreciate it if someone could do a similar test as I’ve described above and reply with the results

[Sweet Pete]

Both manuals on my B2 will bleed through the pedal drawbars.
It doesn't bother me,if anything it smooths and compresses the
overall dynamic range.I've never cleaned the preset panel connections.

Only the bottom manual of my A100 bleeds through the pedal drawbars.I've cleaned the preset panel on it.
Early -2 matching transformers are different than late-2 matching transformers which are like -3 models.
That's why an early AO10 preamp from a '50 C2,didn't sound very good on my '53 B2.

When the -2 tone generators where produced 'non sequential',wired like a -3,the matching transformers where also modified.

[freiburg]

so we all have more or less the same issue.... hmmmm. so is it a fault only on some hammonds or a design flaw?????

[Sweet Pete]

The pedal drawbars are filtered seperate from the lower manual.The two drawbars are a mixture of 8 frequencies.The 3rd harmonic is the only odd one.All others are even harmonics.
3rd harmonic isn't connected for notes/frequencies 20,21,22,23,24.Because this is a resistive 'mix' it is present at the output of the lower matching transformer.Totally normal.
Never regarded this as a flaw or fault.