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Post by PinkFloyd on Jan 23, 2010 14:39:40 GMT
I must say Leo......... the "indeed" or "bravo" amps are a bit more aesthetically pleasing to the eye compared with the "knocked up" version   I'm sure they both sound the same tho'..... Cost me a couple of quid, I only brought the mosfets, the other bits I had in the junk box, I did the pcb using a bit of scrap copper clad and drawn the tracks with a marker pen, etched job done It makes sense to me at least to knock something up cheap first (if its easy to diy), if it shows potential you can tart it up later (or buy the ready made thing) , if it proves to be a pile of crap you've lost nowt and simply bin it and try something else;) And what did you think of the Sijosae Leo? |
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mrarroyo
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Post by mrarroyo on Jan 23, 2010 17:00:40 GMT
Mike, we used the stock 6922 it ships out with. I was going to buy one but got put off by the doubling in price (used to sell for about $65 USD including S&H). BTW, some units ship w/ a 24 volt 1 amp psu. We tried a 24 volt 2 amp psu and the bass was tighter and w/ more impact. Good luck.
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Deleted
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Post by Deleted on Jan 23, 2010 17:32:17 GMT
Hi Mick Been looking at these on ebay, what are your impressions of it's sound as standard. Also do you know what the difference is between this and the one that indeed hifi sells on ebay  Couldn't resist had to press the buy it now button Yesterday ;D I got the Bravo one components looked a little better don't know if they are just seemed that way. Hi Paul, well you pressed the buy button before me, i pressed it this morning, love the look of it, and mrarroyo said its a good sounding unit, which is a good recommendation in my book, so going to try it. No matter how good it is, buy the time the guy`s on here have sorted it, it will be superb. Must say i have a design in my head to make the 4pillars and crown nuts, a bit more "retro", so something for me to" play" with too.  Let you know what i think of it, when its delivered.  I think the different models have varying types of tube, there`s probably more to it than that, but someone will put me right, if that`s not the case  |
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Post by Deleted on Jan 23, 2010 17:58:01 GMT
Hi Guys, I am a know nothing newbie numptie on this forum as some of you are already too well aware , but I have been looking at the Bravo version of this for a while. If I were to press the 'Buy it Now' button would you nice kind and more knowledgeable gentlemen be prepared to help me optimise it with mods? I realise that this may not be any easy question to answer, given that no one knows what's involved at the moment but ...... what do you think? Thanks in anticipation. |
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Post by PinkFloyd on Jan 23, 2010 18:35:33 GMT
This has got to be some kind of "disorder" The bloody thing hasn't arrived yet and already there's talk of bastardizing it beyond all recognition.... I love it!  |
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Post by guadixman on Jan 23, 2010 18:48:33 GMT
I was eyeballing the Bravo thread on Headfi.
A dinky little bugger and you don't get screwed on postage.
Now if only I could use 6SN7/6F8G I'd pull the trigger too.
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Post by Deleted on Jan 23, 2010 18:53:31 GMT
This has got to be some kind of "disorder" The bloody thing hasn't arrived yet and already there's talk of bastardizing it beyond all recognition.... I love it! I'm waiting to find out what tubes you like..... - not forgetting a monster Little Pinkie for it. I've started saving. ;D Ian |
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leo
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Post by leo on Jan 23, 2010 18:58:22 GMT
Cost me a couple of quid, I only brought the mosfets, the other bits I had in the junk box, I did the pcb using a bit of scrap copper clad and drawn the tracks with a marker pen, etched job done It makes sense to me at least to knock something up cheap first (if its easy to diy), if it shows potential you can tart it up later (or buy the ready made thing) , if it proves to be a pile of crap you've lost nowt and simply bin it and try something else;) And what did you think of the Sijosae Leo? fantastic for 2quid The amps sweet as long as its not pushed beyond its limits, obviously never going to blow everything out the water but for what you guys paid for it you can't moan at all, hey if you think it sounds crud it'll make a nice unusual ornament I'm not going to comment on it too much as it wouldn't be fair, its your thread, anyway let us know what you think Regarding mods I would probably only do a nice little psu for it, the component choice looks pretty decent , also keep an eye on those heatsinks, I seem to remember they get pretty toasty |
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Deleted
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Post by Deleted on Jan 23, 2010 19:11:55 GMT
Yes let the Chineeseeee!! make them nice and cheapilllllly!!, then we make them look and sound like the ones you pay, hundreds if not thousands for, sounds sensible to me.
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Post by Deleted on Jan 23, 2010 21:25:41 GMT
you gotta love the basic specs Out-Put Impedance: 20~600 Ohm Gain: 30dB Frequency response: 10Hz-60KHz +/- 0.25dB Signal/Noise Ratio: >90dB Dynamic range: 84.6dBA(300 ohm) 89.8dBA(33 ohm)THD: 0.016%(300 ohm) 0.45%(33 ohm)IMD + Noise: 0.045(300 ohm) 0.42(33ohm) ;D Why on earth do they insist on giving so many valve HAs such ridiculously high gain figures. The original SC HA (Jaycar kit) only uses 6dB gain, although a few members have increased the gain slightly. Having very high gain means having to use only the first 1/4 or so of the volume control and most of the rest of the range usually can't be used. This makes volume control action rather abrupt, as well as further degrading performance by reducing signal to noise figures. Yes, I know, it's only meant to be a fun unit ! Alex |
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Post by PinkFloyd on Jan 23, 2010 21:57:19 GMT
I won't say a thing until I've actually "heard" this amp.... it's very easy to pontificate and assume but, without actually listening to it, pointless. I must confess I am buying PURELY on looks (and the fact it takes 6922 which I have a truckload of)...... from past experience with this type of amp it should be good with 300 ohm 'phones.... there is nothing "wrong" with the design apart from it's "simple" and uses a valve which may piss some people off Of course, a good quality power supply is essential with any amp (if you want to hear it at it's best) I don't expect the supplied "switcher" to be anything special but at $89.99 I'm happy to get JUST the amp. All these Chinese amps are a punt in the dark, some turn out to be lemons and others diamonds..... I've got a good feeling about this one, I hope I am not wrong ;D On looks alone it's a must have IMO, I just couldn't resist it..... Nothing "bad" in the amp design and it will make music..... let's just wait and see what out ears say "when" we've actually listened to it. |
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Post by PinkFloyd on Jan 23, 2010 22:13:05 GMT
This has got to be some kind of "disorder" The bloody thing hasn't arrived yet and already there's talk of bastardizing it beyond all recognition.... I love it! I'm waiting to find out what tubes you like..... - not forgetting a monster Little Pinkie for it. I've started saving. ;D Ian 6922? I've spent years listening to 6922/E88CC and have quite a collection of them (a museum some may call it ) I can tell you, instantly, that the current production Electro Harmonix 6922 that the amp ships with is not a valve I'd ever use..... the old Russian NOS 6H23N / EB are far better built... especially those built in the 60's / 70's / 80's..... the people building the current EH 6922 just don't have the experience and expertise of the workers who built the valves back in the day when valve technology was at the forefront. There are LOADS of 6922 / E88CC variants from made in England to Made in germany to Made in Russia to Made in USA to......... believe me, if this amp is any good I'll cover EVERY 6922 ever made in great depth |
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robertkd
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Post by robertkd on Jan 23, 2010 23:44:11 GMT
@ Alex
Well kinda, the gain will more likely be a function of V/ma transfer and will be a consequence of keeping the design simple!
The distortion indicates the lack of current drive (maybe even plate starvation), but should be mostly even order so hence warm sounding. Maybe a 6n23p-ev might sound cleaner with lower Z phones compared to others??
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Deleted
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Post by Deleted on Jan 24, 2010 9:51:21 GMT
I'm waiting to find out what tubes you like..... - not forgetting a monster Little Pinkie for it. I've started saving. ;D Ian 6922? I've spent years listening to 6922/E88CC and have quite a collection of them (a museum some may call it ) I can tell you, instantly, that the current production Electro Harmonix 6922 that the amp ships with is not a valve I'd ever use..... the old Russian NOS 6H23N / EB are far better built... especially those built in the 60's / 70's / 80's..... the people building the current EH 6922 just don't have the experience and expertise of the workers who built the valves back in the day when valve technology was at the forefront. There are LOADS of 6922 / E88CC variants from made in England to Made in germany to Made in Russia to Made in USA to......... believe me, if this amp is any good I'll cover EVERY 6922 ever made in great depth Judging by the number of us all that will have this amp, all ears will be looking 'ear. The power supply looks a bit naff so at least that and the tube can be changed. You'll also start changing components - I can see it now. The nice thing is, you can actually access everything so easily. They run hot so at leat if anything starting to crisp up, you'll see it. Getting one myself. Thanks for letting us all know about it Mike. Part of the fun of RG is seeing the mods and hearing it for yourself. No pressure!! Ian |
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Post by PinkFloyd on Jan 24, 2010 12:07:07 GMT
I wonder if these would fit.... the phono sockets that are fitted can be had for 15 pence each, they're not the best of quality. |
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Post by PinkFloyd on Jan 24, 2010 12:11:19 GMT
And a nice gold plated headphone socket ;D  |
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Post by PinkFloyd on Jan 24, 2010 12:24:59 GMT
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Post by Deleted on Jan 24, 2010 13:03:50 GMT
I wonder if these would fit.... the phono sockets that are fitted can be had for 15 pence each, they're not the best of quality. There's a guy that had one on HF and they weren't straight as well. Even when pushed fully home - they didn't straighten up. He posted a picture and it did look a bit Mickey Mouse. The other issue that can turn up is the power switch. (Along with a poor quality supply anyway) Some have also turned up dead. It apparently runs hot so that may cause issues, although there's plenty of air without a case but if it's like my old ....... Little Dot, which got so hot, it blew itself away, It made a spark, And did a fart, And now it's had its day. Plenty of scope to play around with and it's cheap which is really nice. Delivery has also been known to take up to four weeks what with postal problems. Looking forward to seeing/hearing what it does actually 'cos I did rather like the old Little Dot. Crude but fun. Ian |
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Post by PinkFloyd on Jan 24, 2010 13:10:51 GMT
It apparently runs hot so that may cause issues Excellent, I could do with a little heater on my desktop.... it's very chilly up here ;D |
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leo
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Post by leo on Jan 24, 2010 14:25:10 GMT
Seem to remember the LM317's got extremely hot used as a current source supplying the valve heaters
If the heatsinks are too small you can forget it lasting long
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mrarroyo
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Post by mrarroyo on Jan 24, 2010 14:41:03 GMT
I tested this unit for about 7 hours and it did not get that hot as some are reporting. I do agree w/ Alex that the gain should be less say under 12, which should satisfy even those wishing to go deaf or use 600 ohm headphones.
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Post by PinkFloyd on Jan 24, 2010 14:46:42 GMT
Seem to remember the LM317's got extremely hot used as a current source supplying the valve heaters If the heatsinks are too small you can forget it lasting long They seem to be pretty substantial, if the pictures are anything to go by:  Anyways, as it's an open frame design there's nothing to stop owners fitting one of these |
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Post by Deleted on Jan 24, 2010 14:52:30 GMT
I tested this unit for about 7 hours and it did not get that hot as some are reporting. I do agree w/ Alex that the gain should be less say under 12, which should satisfy even those wishing to go deaf or use 600 ohm headphones. That's nice to know Miguel. The Little Dot made a good egg fryer even in cold UK. My thoughts were that maybe the people reporting the heating up are in warm places. I find the X-Can varies with my central heating here quite a lot. It's surprising with the Bravo becasue it's open plan with the doors open. The power supply problems seem to be the cable from what I've seen. There are also people complaining about the volume all happening down at the bottom end so the tracking wasn't great. All easily fixed if that's the case. Anyway, I'm just guessing from stuff I've read, so we'll wait and see. We might all get a real surprise with it. You never know. Ian |
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Post by PinkFloyd on Jan 24, 2010 15:03:29 GMT
Yeh, it may burn the house down  |
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leo
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Post by leo on Jan 24, 2010 15:12:46 GMT
Think its the heatsinks next to the valves which are the Lm317's, the valve itself or the mosfets didn't get toasty, it was the LM317's
I'll have a dig around to see if I can find the one I cobbled up
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I'm sure they both sound the same tho'.....
Let you know what i think of it, when its delivered. 
