DefQon
Headphoneus Supremus
- Joined
- Jan 14, 2011
- Posts
- 7,068
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- 147
I'm going to say this again. Replace IRF5/6XX with IRL510/N's or 530's.
I bought a Bravo Audio Ocean amplifier and did some heavy overhauling of the components.
I did the following mods -
1. Replaced the stock mosfet transister (IRF630) with the IRF510. This has opened up the highs considerably and have widened the soundstage.
2. Replaced the 25v rated capacitors with 3300uF 35v panasonic capacitors. This has tightened the bass significantly. The flipside is that the top of the case doesn't closes anymore now due to the size of the capacitors. I prefer to keep them open as the amp runs quite cooler this way.
3. I bought some NOS tubes from eBay. RCA and Sylvania tubes. They sound good with very well defined high end and a bit forward mids, but guess what!! I like the sound of the stock Chinese tubes more than these as they introduce a very sweet sounding distortion. Call me crazy.
I am quite happy with my desktop set up paired up with my Sennheiser HD600s. Pure honey to the ears.
I got my new tube with RCA tubes, clear tops and 5963s. And it does sound very nice. The bass is slighty more detailed than on my crappy Haromix Eh6992 [or waht ever cheapo brand it is] but the mids r a little smoother as well as more treble extension. So I'm a happy camper [and technically I could swap one of my RCA clear tops into my indeed G3] but I'd rather stick with the 6992 tube
Okay, consider this a Public Service Announcement. You truly owe it to yourself to demo at least one of the clear tops (if not all of them) for an extended period. On the 12V side of the house, these are some of the best sounding tubes you can find. They are unique, as tubes go, and they may just change your mind about always using the 6922 because they typically have a blend of clean smoothness and good detail. It sounds oxymoronic, but in my whacked-out G2, they are sweet, sweet, sweet. (Gotta bias... gotta, gotta bias) Even though they have great detail, you can listen to them for hours without treble fatigue. Mine have an excellent soundstage and they all image well. The bass on mine is tight and deep, but there isn't a lot of mid-bass "fog," that bassheads seem to like. This may be more of a function of the big caps I have installed than the tube, though. Yeah, I am a fan of these tubes. When I roll 12Vs, I keep coming back to the black plates and clear tops for lengthy periods (think days, not hours). If you don't want to "season" (break-in) your tubes by listening to music, just leave the amp on, with one in it, overnight. It's a Class A amp, so whether you're playing music or it's just on, it's always juiced the same. YMMV, but I bet there is at least one of your clear tops that will get your attention...
I found it to be next to impossible to adjust the bias on the G3. I've been doing it by ear which I know isn't proper, but the one time I tried to probe underneath I hit the wrong spot and the amp shut down. Luckily I didn't fry it
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I'd planned on installing leads like I saw in a pic in an earlier post but haven't had the time. Heard the project sunrise 2 was easy to bias so shot jeremy an email.Sure enough, easy as you could want. So I couldn't resist and bought one. Suppose to be here tomorrow. Can not wait.
I love clear tops, very unique sounding tube. But my ken rad 5814s are almost a permanent fixture in my fournier. The sound is so rich and creamy, a delicious tube. RCA 5814 black plate has set up shop in my bravo. Love the bottom end.
I've read the same on the bias setting. Hopefully I'll get my leads installed this weekend on my G3. Are there trim pots on the bravo V2? I can't find them anywhere. I read they're under the heatsinks but can't confirm.
I adjust the bias on my g3 easily when i got it... Now im using a $20 Walmart n radio shak meter... Both at 200 ohms. Black lead on the RCA out for ground... Red on the r13 spot... N im getiing no reading... Is it me,the cheap meter or my tube cuz i can't adjust the bias this time around...,n it was easy the first time... Still me n radio shak r having a come to Jesus talk -.-
@the guy on top biasing by ears......get yo'self a multimeter you fool.