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Let’s not conjecture about what it might be. The only worthwhile focus with this sort of thing is objective testing and resultant conclusions…assumptions and chasing ghosts leads to more assumptions and more ghosts. Let’s backup. Remember that I know nothing about the machine or its history...

Okay. I just wanted to verify that was all subjective. I’ll go with “Signals are present in their designated locations. Its barely audible on other PGM OUTs” Swap the dbx cards.

How are you getting your percentage measurements?

Hi. The first step is to find out if this is a recorder section issue, or a mixer section issue. Let’s find out if it’s happening on the way to the recorder section… Assign an input to PGM 1, make sure no sources are assigned to any other PGM groups (especially PGM 3), raise the PGM ODD master...

Thanks. Yeah…the guidance “…you can substitute non polars in place of a polar but not vice versa…” is a dangerous and inaccurate generalization.

Dave…maybe re-read my post? I directed the member to NOT use NP in place of polar parts…and explained why.

Doesn’t matter mixing brands at all. What you want to do though is use quality caps that are low ESR and correct values, and I also generally source 105C temp rated parts vs what you’ll often find as 85C parts. It can be difficult to source 105C non-polar parts. Like none of the Nichicon...

So, many moons later… I sent both headblock assemblies to John French…there were issues with both. I’ll talk about the assembly with the original 3M heads first. That’s the one on the left in the picture of the two assemblies in my last post. I was right…significant wear, significantly poor...

Many moons later the 2” assembly is back from JRF and installed on the transport, fully inspected and lined up, new Thin Brown Line rolling guides installed. I give you…analog eye-candy:

The more ideal way is to bypass each rail to ground as close as possible to the opamp. But often times that’s hard to do depending on the layout. I have to say the only time I’ve added the bypass caps is when I’m “upgrading” an opamp…and I probably don’t need to even do it then because I’m not...

It looks like there’s really only one that would have any potential impact, and it’s C25, a 10uF 16V polar input coupling cap to the EQ circuit block. If you find it is out of spec or close to it then there may be others. It’s not that things won’t work, but when the coupling caps can’t do their...

PM me. I have replacement pots, whole PCB assemblies, etc. But before that consider if you need to recap the input module. It might be worth recapping the EQ section on that channel. My experience is when the caps fall out of spec you can get howling and squealing when you sweep the EQ pots...

Can you summarize your point?

Thanks. I wasn’t sure. I do try to share and help. Thanks for the clarification and the compliment. I appreciate it.

Interesting parable. I’m not sure I understand its application to me. Are you alluding that I don’t share? Honest question…just want to understand your point.

I can’t help myself. It’s a problem. Yeah the issues with the AT-RMX64 are scant user community and technical support. It’s getting harder and harder to find qualified people to work on any analog tape machine, and I feel like there are more and more people selling machines as “serviced”, but...

The 244 and 424 series are wildly different machines. The mixing section on the 424 series is significantly enhanced, particularly on the mkII onward…I like the 3-band mid-sweep EQ on the mkII and mkIII and the fact the hi and lo bands are shelving vs the 2-band swept peaking filters on the...

I have no interest in executing any of this, so no I didn’t work up some slick setup. Anytime one is custom fabricating something it’s going to be…custom. You tell me…how would you mount a PCB power supply assembly? You can buy project boxes online that you modify for your project. So the PCB...

Well like I said I’ve never used a multitrack cassette machine that way, so I’m learning from you.

With hardware. Standoffs…screws…nuts…etc.