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Post by rexton on Aug 28, 2021 15:57:33 GMT
I don't even have a drill bit!!!! What do you mean "inside the valves"? I know which valve is which. I just don't know if the 6H8C should go to back valve socket or the front. Considering there are only 3 valves to each monoblock I only need to know the position of one other.
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Bigman80
Grandmaster
The HiFi Bear/Audioaddicts/Bigbottle Owner
Posts: 16,398
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Post by Bigman80 on Aug 28, 2021 16:14:51 GMT
I don't even have a drill bit!!!! What do you mean "inside the valves"? I know which valve is which. I just don't know if the 6H8C should go to back valve socket or the front. Considering there are only 3 valves to each monoblock I only need to know the position of one other. 6H8C is a 6SN7 equiv, so Id suggest the front.  |
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Post by macca on Aug 28, 2021 16:28:52 GMT
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Post by macca on Aug 28, 2021 16:29:34 GMT
I see Ollies come to the same conclusion  |
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Post by rexton on Aug 28, 2021 16:47:03 GMT
Yes I did actually find that picture and did make that conclusion. Always better to check with people with more brains than myself.
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Post by rexton on Aug 28, 2021 18:42:02 GMT
Well one's switched on, not blown up yet or any green smoke.
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Post by antonio on Aug 29, 2021 1:35:22 GMT
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Post by macca on Aug 29, 2021 8:21:41 GMT
When I said Klipsch I meant the proper ones not those Chinese made boom and tizz things. They aren't at all suitable for single ended amplifiers as the impedance is all over the shop and dips pretty low (3.2R). They're also nothing like as efficient as claimed. |
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Post by rexton on Aug 29, 2021 8:38:24 GMT
I powered everything up last night and nothing blew up for 20 minutes so I think we are good to go. I've not listened to anything yet I'll be decorating today, so maybe tonight if I get chance.
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Post by macca on Aug 29, 2021 8:42:28 GMT
Not blowing up is good. |
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Post by electronumpty on Aug 29, 2021 8:47:44 GMT
Wakefield still stands....
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Post by antonio on Aug 29, 2021 14:38:16 GMT
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Post by macca on Aug 29, 2021 15:04:55 GMT
independent measurements www.audiosciencereview.com/forum/index.php?threads/klipsch-rp-600m-speaker-review.12138/Look at that suck-out between 1Khz and 4Khz, classic 'boom and tizz' voicing. Not 'boom box' as bass rolls off from 100Hz so will be bass-light. Max sensitivity is 93db, average is 89dB. That's 7db less than they claim, which is the same difference as quadrupling the amplifier power required for any given volume level. You can't rely on anything in those reviews since it's very rare you see an internet reviewer whose got even the first clue. Rare in the magazines too. Look at the impedance, all over the shop, that won't be idea for any valve amp especially not SE. Didn't realise they made those models in USA, thanks for the correction |
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Bigman80
Grandmaster
The HiFi Bear/Audioaddicts/Bigbottle Owner
Posts: 16,398
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Post by Bigman80 on Aug 29, 2021 15:34:06 GMT
independent measurements www.audiosciencereview.com/forum/index.php?threads/klipsch-rp-600m-speaker-review.12138/Look at that suck-out between 1Khz and 4Khz, classic 'boom and tizz' voicing. Not 'boom box' as bass rolls off from 100Hz so will be bass-light. Max sensitivity is 93db, average is 89dB. That's 7db less than they claim, which is the same difference as quadrupling the amplifier power required for any given volume level. You can't rely on anything in those reviews since it's very rare you see an internet reviewer whose got even the first clue. Rare in the magazines too. Look at the impedance, all over the shop, that won't be idea for any valve amp especially not SE. Didn't realise they made those models in USA, thanks for the correction "Since I have to score the speaker as designed, it gets my worst rating of "stay away."  |
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Post by rexton on Aug 29, 2021 16:20:39 GMT
Yes Wakefield still stands but these 300b are off back to China. These amps hum like a complete bugger. So, I've got the valves in the correct positions. The amps exhibit no hum from the Tx when fired up but as hum like a complete bugger when you attach them to a passive speaker, this is with no pre-amp connected. I've had several different mains leads from cheap walwart jobbies to some expensive Furutech foo shielded monsters. All hum. Both units work, I've had them playing music. This is a HUGE disappointment. Any ideas why they should hum so badly? I'm going to wait to see if any forum members can come up a quick fix, else, it's reboxing them and back to nobsound. I'm very very annoyed. |
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Bigman80
Grandmaster
The HiFi Bear/Audioaddicts/Bigbottle Owner
Posts: 16,398
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Post by Bigman80 on Aug 29, 2021 16:21:47 GMT
Yes Wakefield still stands but these 300b are off back to China. These amps hum like a complete bugger. So, I've got the valves in the correct positions. The amps exhibit no hum from the Tx when fired up but as hum like a complete bugger when you attach them to a passive speaker, this is with no pre-amp connected. I've had several different mains leads from cheap walwart jobbies to some expensive Furutech foo shielded monsters. All hum. Both units work, I've had them playing music. This is a HUGE disappointment. Any ideas why they should hum so badly? I'm going to wait to see if any forum members can come up a quick fix, else, it's reboxing them and back to nobsound. I'm very very annoyed. Are they humming through the speaker?....just so I'm clear |
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Post by rexton on Aug 29, 2021 16:28:01 GMT
Yes. I've powered one amp up (altough this phenomen happens with both units) and just attached the speaker cable from the speaker to the amp. No other cables. I've just tried powering up from the wall socket and still same old hum, I thought it might be the extension I was using.
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Bigman80
Grandmaster
The HiFi Bear/Audioaddicts/Bigbottle Owner
Posts: 16,398
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Post by Bigman80 on Aug 29, 2021 17:11:16 GMT
Yes. I've powered one amp up (altough this phenomen happens with both units) and just attached the speaker cable from the speaker to the amp. No other cables. I've just tried powering up from the wall socket and still same old hum, I thought it might be the extension I was using. One of the issues I've had with ChiFi stuff is sometimes the sockets aren't always the size they should be. Just make sure the RCA plug is making proper contact with the outer part of the socket. You'd be amazed how often that's been an issue. |
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Post by macca on Aug 29, 2021 17:13:42 GMT
hum is through the speakers so could be a grounding issue.
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Post by rexton on Aug 29, 2021 17:36:38 GMT
I've done a small video. Grounding did come to mind. It should have been bloody well done already. FFS.
They don't actually sound half bad when playing.
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Post by macca on Aug 29, 2021 17:59:27 GMT
I'm guessing you've got all power cables well away from the speaker cables?
hard to tell how loud that hum is from here. A lot of people seem to accept a bit of hum as normal and acceptable for a valve unit even though it isn't. If it's not that loud maybe that's just how they are?
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Post by rexton on Aug 29, 2021 18:09:34 GMT
Yep, speaker cables well away from the power leads and the hum is very loud, it's not the small amount of Tx hum you get. I've had valves for decades and this is the worst ever.
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Post by macca on Aug 29, 2021 18:42:29 GMT
I'd be tempted to hang onto them and get them sorted, it's only marginally more hassle than sending them back.
I can't see the problem being too hard to locate and fix, not like with a solid state amp with a billion components.
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Post by rexton on Aug 29, 2021 19:03:58 GMT
It's so sodding annoying.
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Post by macca on Aug 29, 2021 19:27:45 GMT
Could be the suppled valves are dodgy. Are they some no-name make?
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Post by pete on Aug 29, 2021 19:31:50 GMT
Have you tried different power cable?
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Bigman80
Grandmaster
The HiFi Bear/Audioaddicts/Bigbottle Owner
Posts: 16,398
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Post by Bigman80 on Aug 29, 2021 21:00:11 GMT
For both units to be humming as badly as you describe, it has to be something internal.
Could be bad valves, but seems unlikely.
I'm at a loss as to what's causing it, sorry Andrew.
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Post by rexton on Aug 29, 2021 21:31:04 GMT
PS Vane for the 300b's, the other are Russia no name. I've emailed Douk, lets wait and see.
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Post by antonio on Aug 29, 2021 22:44:27 GMT
Disappointing for you, for it to be valves, two valves have have to have the same problem, let's hope Douk come up with a solution
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Post by antonio on Aug 29, 2021 23:16:52 GMT
independent measurements www.audiosciencereview.com/forum/index.php?threads/klipsch-rp-600m-speaker-review.12138/Look at that suck-out between 1Khz and 4Khz, classic 'boom and tizz' voicing. Not 'boom box' as bass rolls off from 100Hz so will be bass-light. Max sensitivity is 93db, average is 89dB. That's 7db less than they claim, which is the same difference as quadrupling the amplifier power required for any given volume level. You can't rely on anything in those reviews since it's very rare you see an internet reviewer whose got even the first clue. Rare in the magazines too. Look at the impedance, all over the shop, that won't be idea for any valve amp especially not SE. Didn't realise they made those models in USA, thanks for the correction -- "You really need to listen to these Klipsch, they are very, very good" -- It took me a couple of listens to realise which speaker I preferred, not forgetting these B&W's are twice the price, and they did make him sell his Kef LS 50's |
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