Recent content by Mike McLane

I've been working on taking a Particle Accelerator into a Class D amp to drive a conventional speaker cab. Have gotten less than stellar results. The output was muddy. . . . workable, but muddy. I even bought a Milkman Amp 100 to find out what his secret was. . . no secret, his output...

Would it be possible to defeat the speaker emulation for running into a conventional speaker cab powered by a Class D amp?

I notice that Mad Professor units are "making the rounds" on YT again. The Sweet Honey & Simble were hot items a number of years back, but I was always curious about the Predriver. It claims to have EQ enhancements, compression & boost all rolled into one. Sounds interesting, but does it have...

I built a Cleaver for a friend w a foot switch to toggle btw normal and hot settings. Also plumbed a separate volume knob for the hot setting. He says its TOO hot. He normally puts about a 6-8 dB push on his Strat at all times and wants something a step up from there for solos. etc. It...

I'm using a 9V-1.7A PSU. In checking on the 12AT7 & 12AU7 I come up with 300mA each for heaters + 20mA (12AU) + 10mA (12AT7) = 630 total. I can't tell from looking at the Sushibox HVPS where the current supply for the heater(s) comes from. I assume from the "VIN" as shown in his schematic...

I wish I could say I was a newbie. I have NO electronics background. I'm using Sushibox's SMPS and Vig398 speculated that 30mA was near the top end of its current capacity. I'm guessing that this tube tandem and circuit are easily requiring over 20mA and when you get to the outer reaches of...

Hmmmm? . . . got up this morning and took the tubes out. I get 370v out of the PSU. The 12AU7 gets much warmer than the 12AT7. If I read the data sheets correctly it also pulls tons more current (20mA?) than the rest of the 12A*7 family (5-10mA?). If 30mA is near the ceiling for this unit...

It's the power amp stage only of the Robinette RR763 Micro. . . a 12AT7 & 12AU7. I'll "push" it with the Particle Accelerator. I'm trying the SMPS in place of conventional PSU/rectifier/power tranny, etc. I'm testing the output directly off of the + lead of the SMPS.

Just finished an experimental build on a breadboard with the high voltage SMPS mounted on a side panel. Last time I used it got 250vdc on the nose, but now I can't coax more than 167VDC out of it. Any thoughts?

Understood. Makes good sense. I sent an email to Primary Windings about a US distributor or shipping charges from Britain. Thx for the recommendation.

I discussed the current capacity of the Sushibox SMPS with Vig398. He's guessing 30mA. His off-the-cuff recollection of the current requirement of 12AT7 (phase inverter) = 5mA. . . 12AU7 (push/pull) = 20mA. That would need to be verified, but if that's the case the Sushibox SMPS is near the...

Thx! I followed the link, but unfortunately I'm not a very well educated electronics guy so I can't make a credible evaluation. Maybe Vig398 or someone else has thoughts. The 125B and the one Creach cited are about the same size (tad slimmer than 2" cubed) and are certainly small enough for a...

Hmmm. . . interesting. Are you in Britain? It's almost identical in size to the Hammond 125B, but IS significantly cheaper. Wonder if I can get it in the US without getting clobbered on shipping? Thx.

Oh, you're no fun. . . . Not a biggie. It's still pretty small and not too pricey. Thx!

Looking to build a Robinette 763 Micro. The archetype 125B output xformer is reasonably small, but I wonder if there might be an even smaller alternative as the amp is only putting out 1W and the 125B is designed for much heavier duty. Any suggestions? Maybe something designed for a headphone amp?