you've disappeared again . has what you have done changed the tone of the amp?
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what he said was that it causes the amp sound to ''clip'' earlier , which I've heard . At times it can sound harsh, but you're saying changing resistors around the MOSFET can reduce this
I think what it comes down to is the amp is just too loud even at 10 watt, as are most tube amps compared to the solid state equivalent . Luckily with the AC10 it sounds good even with the master volume at about a quarter turn. With it being single channel if you reduce the gain by changing resistors as you have, then you may end up with too little gain. Depends what you want. Controlling gain is easy for me. I crank the gain higher than the master, like gain at 3/4 turn and master 1/4 or less then i get a good crunchy overdrive. That is when playing at home. Gain always needs to be higher. The opposite applies for a clean sound, although I can have the gain at mid day and Master at 9 am and it will still be fairly clean- Edited
Just to add to my previous, you state at one point, ''the LND150 FET is not configurable by changing components on the fly'' it is in a way. If you change the nearest tube to the guitar input to a lower gain one -like a 5751, it will cut gain or distortion by a fair amount. I tried it ,and after a time changed back to the 12 AX7 / ECC83, the best all round pre amp tube - IMO
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sorry, I've not been logging on recently, first time I've seen this. I don't get too deep into changing resistors and caps. However the last thing I would do is lower the gain as it's not that deep as it is. That's the first time I've seen the MOSFET. Is that the gain pot above it to the right ? they put that in so as to achieve gain at lower volumes and I believe to avoid having a third pre amp tube.
My chief gripe is that it's too loud, maybe a load box or attenuator could help. One amp tech said the pre amp is set up 'too hot' on these. They were built to a price, but it sounds good and sells well. The worst aspect is the closed back-which i modified on mine...
I'm also looking to use a cab with a 12" speaker...hello. have you finished modifying this amp ? you mentioned the pre amp tubes and the likely hood of a pocket of hot air building up in the top half of the case. I tried tube shields, often made by Belton -without the internal spring...regardless, they run a lot cooler than the two EL84's
- In Rory’s wood
Yes...
Does anyone still own a Parker, or maybe owned one in the past ? In particular the Strat model
hi.. you didn't answer the other message, but can I just ask , are there 321 volts going through the EL84 ? or perhaps I've read it wrong
I notice you did mention the LND150 in an earlier post ..
I would paint the inside of that little box with white radiator paint ..
modulator thanks for that...I'll absorb it in small amounts ! I think if you asked an amp tech to do this it would be quite costly. One of the things I did to mine was get my local tech to change the value of the grid resistor, cant remember the value. Have to check. The 12AX7 pre amps work well for me-clean & overdriven. Two Electro Harmonix. J J for power. pre amp tubes with less distortion affects other aspects
Cant see it mentioned here but the signal from the guitar first goes into a MOSFET - LND150, this is the V1 position and there is one of those in the reverb unit. According to one tech I spoke to the circuit in the pre amp is hotter than it need be. That's why it's so loud, and turning up the dial it causes the sound to clip earlier. I have bought a Jensen 16 0hm Alnico this goes into extention cab. At home volume and gain are less than quarter open. I raise the gain as needed..more laterIt would be interesting to see ...
modulator I remembered this post from nearly 3 years ago . At the January 2024 NAMM , Vox announced hand wired versions of the AC4 (again) and also the AC10. The 10 would have a square semi open case , 12" speaker, effects loop and high/low inputs, digital reverb. All very good but I have not seen this in the shops or online. They were meant to have been out in May/ June ..maybe Vox have had reservations about cost or the spec
A job for an amp tech or contact nearest Vox service centre
Thoughts on the TM series amps....retail price and could all amps be like this? do you have one ?