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Tech-Talk Design & Konzepte / LND150 Effect Loop for Hammond Organ (ao-28 amp)
« Letzter Beitrag von vegardbjerkan am 23.09.2026 10:07 »Hello residents of Tube-Town!
I have just built an effect loop for my Hammond Organ out of the LND150 kit. My goal was to create the most neutral loop that only balances the level in and out and nothing more. The effect loops I have used earlier have included a tube, and they are OK but I have had some issues with all of them, and they also seem to colour the sound a bit.
I use a tube socket to hijack the signal from the 12BH7 tube in the AO-28 preamp, and grab the signal from the viper of the tone control and 285V+ from the plate. The reason for this tube socket is so I can easily bring the loop to other organs when playing on rental backline.
I built the kit with the recommended voltage divider testing ratio 1:10.
The kit turned out aaalmost perfect, but I am loosing some low end. I tried playing around with send and return volumes, and it's very close but I would love to build a version with no low cut. Unfortunately I don't understand much of the curcuit, does anyone have any tips to how I could modify the kit to get rid of the low frequency loss?
Thank you!
I have just built an effect loop for my Hammond Organ out of the LND150 kit. My goal was to create the most neutral loop that only balances the level in and out and nothing more. The effect loops I have used earlier have included a tube, and they are OK but I have had some issues with all of them, and they also seem to colour the sound a bit.
I use a tube socket to hijack the signal from the 12BH7 tube in the AO-28 preamp, and grab the signal from the viper of the tone control and 285V+ from the plate. The reason for this tube socket is so I can easily bring the loop to other organs when playing on rental backline.
I built the kit with the recommended voltage divider testing ratio 1:10.
The kit turned out aaalmost perfect, but I am loosing some low end. I tried playing around with send and return volumes, and it's very close but I would love to build a version with no low cut. Unfortunately I don't understand much of the curcuit, does anyone have any tips to how I could modify the kit to get rid of the low frequency loss?
Thank you!
Ich hatte nochmal alles auseinander genommen und die Platine genauestens untersucht. Dabei sind mir noch viele weitere verdächtige Lötstellen aufgefallen, besonders im Bereich zwischen den Potis und den Vorstufenröhren. Besonders auch an den Pins der Transistoren, die die Signal-Stränge jeweils auf Masse ziehen, je nach Kanal. Dort wird die Platine durch die Montage mit den Potis stark belastet und der Bereich war vorher optisch verdeckt von dem Blech der Frontblende. Außerdem wird die Platine in dem Amp immer wieder sehr heiß, weil die Lüftung echt bescheiden ist.