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Hi,
Is some one familiar with the hum for the Vibrato / Trem on F.ender Reverb PCB 4.0.
I have a hum when i switch the Trem on. Reverb is clean and quiet, amp is hum free and quiet.
It s a loud hum when i switch, with a 2 button switch the Vib on.
If this sounds familiar to you, please let me know. Suggestions, Tips let me know. Thnx in advance. Henri
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Hi, my 1st post here. I'm in Canada and just ordered the FOX30 PCB, and I'm wondering where i can purchase a bare chassis for this build. I order a lot of stuff locally out of Toronto, and also the U.S., but I can't find a chassis this side of the Atlantic. Anyone have a lead on where I can purchase one from plz??
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Has anyone had any luck ordering parts for this board using Beta version spread sheet.
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Hi I'm about to melt some solder on a DC 30 build and would like to hear from anyone who has built one. Any suggestions or advice about avoiding problems or getting great sound or any other aspect of building one of these will be most welcome, I have already read a suggestion to get the 10watt resistors off the main board to avoid cooking the board which sounds reasonable, Ill set these on tag boards. I'll be using all Hammond transformers 1750TB, 290MAX and 194E The other suggestion I have heard is to shield the OT to stop the ef86 oscillating, easy enough to do
Thank You in advance
Tim
I’m still in the planning/ordering phase, so other than saying I’m interested in seeing how your build goes, I have a couple of thoughts I’d like to put out there for others considering this build:
Consider using stand-up style transformers. Given the large footprint of the PCB and the number and placement of the tube sockets, you may not be left with much room in many enclosures. I ended up buying Heyboer transformers, which are lay-flat, and from a rough sketch I can already tell things will be tight. That’s a bit of a regret, as I think I may have to elevate the board. Oh well.
Consider increasing the 100 ohm screen grid resistors to 1K, 2/3 W. Current-production EL84s aren’t the most robust tubes out there, and this adds a bit of extra protection at minimal (if any) cost.
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I was wondering if there was a specific part number/manufacturer for the PCB mount 25K pot? I'm having problems finding one that matches the pin layout on the PCB.
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Hi guys, Andrea here!
I'm finally excited to share with you that the PCB for the Mesa MK2C is ALMOST completed. We're almost ready for a first production batch!
If someone has experience with this type of amp, I would love a second pair of eyes. Happy to offer a free board/discount for anyone willing to help ;) Let me know below the post
Cheers
Andrea Founder - AA Electronics
Hi Andrea,
I've had success with a handwired Mark IV clone, and know the Mark topologies and schematics pretty well. I would love to evaluate a board for you guys :)
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Hey everyone! Getting stuck on my SLO 100 build. Any help would be greatly appreciated, so thanks in advance!
I believe that the problem is between the Input Jack and the Return Jack, but I can't figure out where.
Symptoms: When instrument cable is plugged into the Input jack, no audio passes. There is a noise floor hum. All LEDs illuminate as intended. After a few moments, my current limiter gradually increases in brightness until it glows brightly (and remains bright). As the bulb reaches full brightness, the indicator LEDs for channel selection start to dim.
When I plug the instrument cable into the Return jack, the amp passes signal. The audio is full and works on both channels. Interestingly, the channel LEDs pulse in brightness slightly when audio signal is applied - there is a direct link with applied audio signal and the LED brightness.
I've pulled V1, V2,…
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Hey guys! New forum - I assume this is still the place to ask for tech advice!
I'm almost through the Dumble #102 build, and I'm using a Fender Twin power transformer that doesn't have the 6v Aux Tap for the relay circuit.
Would it be safe to pigtail/tap off the 6.3 heater voltage?
Thanks in advance!
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A picture of my first AA PCB build. This was built on the 763 Deluxe Reverb plans, but it's in a Super Reverb Chassis to gain the mid pot. Another departure from the norm, I used 20 watt transformers from a Hammond Organ.
The build went really well and sounds great.
welcome. Be careful when ordering a chassis from the US, our government is nailing us hard these days. Anything steel it seems.
Not on this side of the Atlantic, but have you heard of Modulus Amps? I've had good service from them on chassis and face plates. Shipping is not expensive and things come quickly.