The Amp Garage

EDIT: may have figured something out. I followed the 'adapted layout' for setting up the bias pot which shows a 47k resistor off the bias pot to ground. Talbany's shows a 27k resistor. Wonder if that's my issue. When I get a chance, I'll go back through that area and make sure it's setup like talba...

I've done quite a few 1x12 speaker shootouts with various ODS amps. my favourites: EVM12: solid, neutral speaker, lets the amp shine especially at volume. celestion Uk Classic lead 80: Joe Bonamassa speaker of choice. fairly neutral sounding ceramic but with the Celestion sound. Celestion G12-65 UK...

Cool - thanks for both suggestions. I'm going to look into both of them. Leaning towards the rivnuts right now but keeping an open mind! Though I do like the Texas Heat that I have the amp paired with, I did purchase an EVM12L to try out. It was listed as Series II, whatever that means, but from wha...

I have some final photos for you guys: IMG_4993.JPG IMG_4994.JPG IMG_4995.JPG The only other thing I might do is change the chassis mounting nuts. I'm currently using these: https://www.aircraftspruce.com/catalog/hapages/anchornutsk1000.php , which say they are for 8-32 but don't seem to match up wi...

How do you guys go about cutting the rounded edges in your back panels? I gave up trying to cut a consistent line with a Jigsaw a long time ago. These days I use a circle jig. You can buy a commercial one or easily make your own. Here's an example on amazon: https://www.amazon.com/dp/B01K86VSSI/ref...

Point to your Rockler jig, please. I had a miserable time trying to set up my table saw for finger joints. I have this one and I like it quite a bit. https://www.amazon.com/PORTER-CABLE-4216-Super-Jig-Dovetail/dp/B000HGL59M That's a nice looking jig! Definitely looks like it does the job! Just a co...

Point to your Rockler jig, please. I had a miserable time trying to set up my table saw for finger joints. So I've only ever used my router / table for making box joints. Here is the router jig I used from rockler: https://www.rockler.com/router-table-box-joint-jig Although a surprisingly small jig...

Thought I'd post a few pictures of the head building process. Finally built the bullet and bought a box joint jig to make nice joints. My previous jigs were homemade and I could never get my joints quite right. This jig from Rockler is awesome though! I still have some filling and routing to do of c...

I'm curious if adding bleeder resistors to the caps in the doubler circuit would help...this is me just spit-balling - I have no idea.

A couple updates: I had a successful transplant of the 12V transformer, so my OD, FET boost, and PAB are back! $20 lesson learned on that one. Also, I could not handle the buzz from the chassis. I don't think it was really coming through the video I posted. It was loud enough that I could hear it a ...

Of all the people who have responded, I'm the last one you should listen to, but: Having just finished one of these builds myself - a #102 - I found the same issue as you. To get a nice clean, it seemed like it was at the expense of making the OD a bit too trebly. After tinkering for a while I reali...

This is a 100w amp, right? (Four power tubes?) So with the OT resistance/V drop method, the reading you get is for two tubes. With the cathode shunt method, that’s the current for one tube. Thanks for clarifying that - makes sense to me now! Before anything, make sure you have a good volt/multimete...

I cant hear anything wrong. Transformers can buzz a little, and buzz louder when you switch on the high voltage. Did you leave the nuts on the transformer when you inslalled it? (The nuts that are on the bolts of the transformer need to stay on and sit between the transformer and chassis. You need ...

I can't see your rectifier. Do you have caps in parallel with each diode? Sometimes the caps themselves can make mechanical noise from vibration at 60Hz. Sounds like a fish tank pump buzzing. As mentioned above, I would say this is a very good sound description - maybe you can tell from the video I...

And here is the video - note that the amp is off to begin with, switched to on / standby at 3 seconds. Then switched to on / play at 20 seconds. I then reverse the order as I turn it off. Sorry for the poor quality!