Voltage selector switch, fuse and mains connector. Transformer output cables with heat shrink. All images by rsjsouza at The first thing that caught my attention is that there is heat shrink tubing all around and several wires are protected by woven fabric insulators when crossing high power components - although some 5W resistors touch some wires when the main board is completely in place (not a big fan). (together with a small teardown) Since 2002 I own an Instrutherm FA3005 (Mastech HY3005 clone manufactured in Brazil, 0-30V 0-5A single output) and the build is overall very good. I am still breaking mine in and forming my opinion and will review it soon.By looking at the excellent teardown of the Mastech HY3005F by jamesp15 and his last two pictures with all the transistors attached to the beefy heatsink and mounted with the silicone TO-3 insulators, I would like to tell my story with these. It uses all USA parts with a high quality transformer. It sells for $450 but it doesn't need modification. Worth mentioning is the Warm Audio WA-12, based on API 312.
#2n3055 transistor gap 73 pro
If so, he will do everything Zen Pro does but has custom transformers that do a brilliant job! Bryce modded my Pre73 and it is incredible sounding! I've recorded on Neve consoles and my Pre73 is definitely in the same ball park.
#2n3055 transistor gap 73 mod
I would recommend contacting Bryce Young, owner and founder of Warm Audio and kindly ask him to mod your pre73. I have heard the clip comparisons and I could clearly hear the difference. Zen Pro's mod probably can get you there, however, I have not been able to test their mod myself. NOW, I believe that it IS possible to get in the 9-10 range by modding budget outboard preamps like the GAP Pre73. Then you have your NEVE, API, etc pres at 9-10 depending on the quality integrity. And you end up hearing way more detail than your standard interface pres. Moving along to level 3-5 and you've got your interface preamps like on your Steinberg MR816, Apogee, etc (I know some people will disagree here.) Then you have your clone pres like GAP Pre73 which easily take you to 6-8. At 1-2, you have your budget Behringer pres that they put on the lowest cost mixers. I think a good spectrum comparison an a scale of 1 to 10 would be this. I think it is important to recognize that the stock GAP-pre73 DOES have the Neve character, even without the mods. But also, you hear more detail once you have better quality components. I first bought my pre73 about a year ago and while it did sound Neve-ish, the high freqs were not really present like the real Neve preamps. I strongly recommend modding your GAP pre73. This really makes it seem like the right thing to do, and if I win the megamillions this Friday, I won't even be worried about it at all! But given my budget, I'm wondering if the money is well spent, or if it's just a very marginal benefit that isn't quite worth it. Tantalums + Transistors = our ZenPro TT Mod It's a meaningful mod and a step in the right direction for sure. The Carnhills are very expensive, not to mention hefty shipping and import fees to bring them from the UK. Partial modification is fairly labor intensive but lacks the most expensive part, which is transformer replacement.
#2n3055 transistor gap 73 full
Transformers + Tantalums + Transistor = our Full ZenPro Mod I've listened to some of the shoot-outs, and while I can hear a little more smoothness with the modded versions, I'm not convinced it's that noticeable in the context of a full mix.įull modification of these units includes replacing the stock Chinese transformers with Carnhill on the mic input and line output, using original Neve value tantalum capacitors in the signal path, as well as installing and re-biasing a NOS Motorola 2N 3055 output transistor which was used in the original 1073. I'll let you guys know if anything fishy happens.Īnyways, the point is, should I mod this thing or what? I know a lot of people who absolutely swear by the mods, but as someone who studied economics in school, I'm trying to figure out whether diminishing marginal returns are kicking in, or if I'm really up against a night and day difference. In any case, I decided to buy the PS-AC4 to solve the problem altogether, and so far, it has. Two of them have failed me, and both were always receiving power through my Furman PL-8C power conditioner, so I have a hard time understanding why. I really appreciate his effort to contact me, and I am definitely a proponent of GAP products, but I must say I'm not impressed with the chinese power supply company they're using, and they should switch. Bo Medin from GAP personally contacted me to apologize and let me know he thought this was strange. I have a stock Golden Age Projects Pre-73 mic preamp.īY THE WAY, I'm on my 3rd PSU for this thing.
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