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Hey Guys!

Creating another post since it seems like the forum has been more active. I have a dead SLO 100 on my bench that has been languishing for over a year. Here's what is going on:

Amp powers up, relays work, all tubes glow and get expected voltage. Bias circuit works. After some time (approximately 30 seconds to one minute), the current limiter bulb slowly grows in brightness until it is BRIGHT, and at the same time, the indicator LEDs for the amp's channels dim.

I'm using the recommended power transformer. This problem only happens when the power tubes are installed, and I've checked the power tube pins and circuit a million times.

Any help would be wildly appreciated. Dr. Andrea? Thanks!

I’m wishing to build a vintage style AC 30 however I don’t have much faith in the vintage layout. Can the fox 30 board be fitted to vintage chassis and built up?

The idea being to build a studio quiet AC-30.

Thanks for your assistance

Regards

Mark

I was under the impression that the #183 ODS board configuration was kinda plug and play only to find out if you don't have a specific tap on your power transformer you have to use different 5V relays and not BOM specified 12V.

or add an additional 12v power source? Sorry for the rant,but did notice people with a small transformer in their build images,now I know why....no mention of it on the layout. I am really green at this so maybe it's just me and I can't see it on the schematic? I'll keep searching for answers....

I'm totally pi**** off!

Have you ever bought a circuit board anywhere where neither the component labels (R1, R2, etc.) nor their values were printed on it?

Nothing! Absolutely nothing...

That's what I got after placing my order!

Check out the Black-Eye hot-rod board.

ALL, I am here because my brother and I were in the process of building a ODS but decided to use a quad of EL84s instead of 34s. Well my brother has since passed away from colon cancer in Augest '25. He was going to build his own eyelet boards and engineer this whole project. Then I found this site with the boards and layout and thought I could probably do this....? We had already purchased the transformers and chasis, Hammond 370FX and 1750G. I really hope if someone could just chime in with some "definite changes" I will need to make to get this thing to function with 4xEL84s. I just purchased a Hammond 194E choke (VoxAC30 30H 100ma). I'm thinking that might have been a wrong move. According to Google A.I. it was.... This is really a big undertaking for me.But thought it would be a huge learni…

I've noticed a discrepancy in three of the resistors listed on the BOM for the Dumble builds, when compared to the layout and schematic. R24 is shown as 1 watt in the BOM but 2 watts on the schematic and layout. R25 and R26 are shown as 2 watt on the BOM but 3 watts in the layout and schematic.

Can anyone help with any ideas why they would stop working?

Thank you, Bill D.

Hi all,

Hope everyone is well.

I am currently building the ODS 3rd gen. I the bom it specifies a fender twin PT (022756) Hammond make an exact replacement model no 290fex. My issue is the schematic and the layout call for a 3.15v tap from the transformer but, the required PT doesn't have it. Am I missing something here? Is there supposed to be a way to connect the heater wires even without the 3.15v tap?

Any help would be greatly appreciated.

Thanks

Hello, I bought 4 boards from your store and paid for them, but you refunded me. I don't know what happened, and I asked you but you didn't reply. What exactly happened? I have already arrived at the computer case, only the PCB board is missing