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Hi @vigilante398, I was looking at the layout you are using and I have a question about generally avoiding the feedback and oscillations in the tube circuits. Have you encountered this problem when designing your preamps? I have built a circuit similar to the Space Heater and have to be very...

My last order had the invoice scanned and sent to DHL by Tayda so all I had to do is to approve it on the DHL customs web page I was sent. I had to describe each item of the invoice on the same page. If the information from the sender doesn't match or is missing you can send your invoice or...

You are right. There were some changes in July 2021. My current package from a few days ago cost me quite a lot. The worst part is the fees to DHL for processing VAT and customs. I paid 0 for customs fees and had to pay import VAT (21% in my country) for the package and shipping cost +...

I used to order from Tayda using their standard 3$ shipping and every time I tried to order for less than the 22€ limit to avoid customs fees. The problem with using DHL is the fact the price of the shipping service other than the national post is added to the value of the order. If you want...

That is good to know. So this means the current oscillation problem is probably caused by the bad layout I guess. Can you also measure Vpp and Igss of the jfets? I am curious if they are off the shelf component or if they are pre-selected for having specific parameters.

I moved those 2 caps yesterday and it helped but it did not solve the oscillation problem totaly. The gain is definitely lower and the oscillation is still there but only at the very end of the gain pot. I will try to select transistors with higher Vp. Right now I have all of them in the range...

It looks like it but there are different versions of this type of Diablo. There is a Gain+(pedalpcb) that has a switchable gain stage with trim pot adjustments and there is something like Boost+ (the photo from music6000 probably) which has only a different pot (setting of gain) that is changed...

That is a pity I thought this was the problem :-/ I have rev2 PCB which I have bought from musikding as a kit in December.

OK so I think I've found the problem. There is an error in the schematic that raises gain circa 2 times in every gain stage. This is revision 2 This is the schematic that can be found on the internet with the different connections of C4, C9 and Bass+ trimmer. This is the quick simulation...

I have the same oscillation problem. I have omitted the high cut filter in rev 2 because it is not needed in the original one. It squeals in the top third part of the gain knob. This is probably a PCB problem and should be fixed. I will try to select transistors with lower gain but I don't think...

Hi, does anyone know where to get these knobs? They look unique but I do believe there has to be some source to get them.