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Post by Deleted on Feb 25, 2019 20:45:53 GMT
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Bigman80
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Post by Bigman80 on Feb 25, 2019 20:58:53 GMT
That’s a hell a big cover, thetransformers must be big. I’m sure I recall that they weigh a great deal too |
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Post by Deleted on Feb 25, 2019 21:24:04 GMT
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Post by Deleted on Feb 25, 2019 21:26:02 GMT
Thing is I'm not a big fan of KT's the humble el34 is my valve of choice.
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Post by Bigman80 on Feb 25, 2019 21:39:17 GMT
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Post by Deleted on Feb 25, 2019 22:06:18 GMT
Absolutely beautiful work
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Post by Deleted on Feb 25, 2019 22:44:27 GMT
Thing is I'm not a big fan of KT's the humble el34 is my valve of choice. Seem to remember decades ago Audio Note UK's Peter Qvortrop saying in an interview for The Audiophile, that, in his view, the EL34 was - how can I say this? Was... well... er... - I'm only repeating his view - was - shite for audio use. Reading his comment did surprise me, as I thought about the number of amps that successfully used it, apparently unaware of the fact. |
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Post by Bigman80 on Feb 25, 2019 23:10:09 GMT
Thing is I'm not a big fan of KT's the humble el34 is my valve of choice. Seem to remember decades ago Audio Note UK's Peter Qvortrop saying in an interview for The Audiophile, that, in his view, the EL34 was - how can I say this? Was... well... er... - I'm only repeating his view - was - shite for audio use. Reading his comment did surprise me, as I thought about the number of amps that successfully used it, apparently unaware of the fact. Including the Audio Innovations Series 500:lol |
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Post by Deleted on Feb 25, 2019 23:45:53 GMT
PQ can shut up! The EL-34 can sound very nice in the right amp!
S.
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Post by Deleted on Feb 25, 2019 23:52:14 GMT
PQ can shut up! The EL-34 can sound very nice in the right amp! S. Those 'Modern Classic Tubes' monoblocks of mine that you heard were Class A EL34 amps Shane. Damn fine sounding units! |
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Post by Bigman80 on Feb 26, 2019 1:07:12 GMT
PQ can shut up! The EL-34 can sound very nice in the right amp! S. Just not his lol  |
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Post by Deleted on Feb 26, 2019 7:58:28 GMT
That amp looks really tasty... slightly jealous. And El34's are great  I have a set myself (basic mullard 5-20 circuit albeit at lower voltage and some foo military spec valves, bonus when your father in law builds himself a pair of amps in the late 50's and happens to work at a defence company) |
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Post by Bigman80 on Feb 26, 2019 9:10:52 GMT
This is exactly the sort of thread I love and it’s the reason why I wanted a forum in the first place.top stuff
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Post by radfordrevival on Mar 1, 2019 22:14:53 GMT
Hi all - will answer any and all questions here soon - have been very preocupied finishing amps and developing a very exciting new product!
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Post by Deleted on Mar 1, 2019 22:19:00 GMT
Have you finished mine?.....Will, Will.....Have you finished mine......?
👍😁👍
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Post by Deleted on Mar 1, 2019 22:21:22 GMT
Exiting new product !!!........ 👍🙏
Can you give us an exclusive?
Dont keep us in suspension.
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Post by Bigman80 on Mar 1, 2019 22:26:30 GMT
Hi all - will answer any and all questions here soon - have been very preocupied finishing amps and developing a very exciting new product! As long as it’s not a grounding box, we’d love to hear more |
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Post by radfordrevival on Mar 2, 2019 0:47:21 GMT
How does 100W KT88 or compatible monoblocs sound  |
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Post by Deleted on Mar 2, 2019 0:49:05 GMT
How does 100W KT88 or compatible monoblocs sound Sounds exciting, if terrifyingly expensive! |
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Post by Deleted on Mar 2, 2019 8:57:55 GMT
How does 100W KT88 or compatible monoblocs sound Sounds good Will, look forward to following the project. Although mentioned earlier im not a big fan of KT valves, i suspect this is more to do with the fact that ive never heard a well designed amp using them, as opposed to the actual valves themselves. This was probably the best one i owned......  via Imgflip Meme Generator via Imgflip Meme GeneratorThey sound very detailed / clean / and dare i say a tad boring if you know what i mean........ |
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Post by dsjr on Mar 2, 2019 9:31:19 GMT
The high output impedance can play total havoc with modern 4 - 6 ohm speakers with roller-coaster impedance curves. Mind you, anything with 'Radford' on guarantees audiophile interest and good sales off the top of it, so sincerely, all the very best with that (I'm not being sarcastic).
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Post by Deleted on Mar 2, 2019 10:33:22 GMT
Who cares about an opinion. It is my money, my ears, my music, do not give a fig what some expert believes or expresses. I make my own choices always have always will.
I find the EL34 a smooth power tube and the KT a tad rough. Anyway the differences are in the input stage, never bothered to seriously roll power tubes. Tried it with different EL34's could not tell the difference. Every amp is different no gospel on this one.
I have one amp running EL 34's and the Mono Blocks 6CA7's, same thing right, no not in this case, swap tubes around and the EL34 amp sounds dark and recessed with the 6CA7's; same story visa versa.
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Post by macca on Mar 2, 2019 12:31:20 GMT
The high output impedance can play total havoc with modern 4 - 6 ohm speakers with roller-coaster impedance curves. Mind you, anything with 'Radford' on guarantees audiophile interest and good sales off the top of it, so sincerely, all the very best with that (I'm not being sarcastic). Jammy's not going to have that issue with 16 ohm Ls3/5a though. First time I heard an STA15 was through QUAD ESL which I believe have some up and down in the impedance curve. It was still a revelation. |
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Post by radfordrevival on Mar 2, 2019 13:44:27 GMT
The high output impedance can play total havoc with modern 4 - 6 ohm speakers with roller-coaster impedance curves. Mind you, anything with 'Radford' on guarantees audiophile interest and good sales off the top of it, so sincerely, all the very best with that (I'm not being sarcastic). To be fair, in the case of the Radford, the output impedance is only around 0.2 ohms in the midband, rising slightly at either frequency extreme. My new design aims to equal or better this, with less rise at the extremes. I've not directly measured the output impedance of the prototype yet but for what it's worth I've stuck a 1 ohm resistor across the speaker with it playing with no noticeable reduction in output (apart from current limiting at higher levels at a very hot resistor in my hand!). Highly unscientific but tells me it's going to be a small fraction of a ohm. |
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Post by Bigman80 on Mar 2, 2019 13:50:18 GMT
The high output impedance can play total havoc with modern 4 - 6 ohm speakers with roller-coaster impedance curves. Mind you, anything with 'Radford' on guarantees audiophile interest and good sales off the top of it, so sincerely, all the very best with that (I'm not being sarcastic). To be fair, in the case of the Radford, the output impedance is only around 0.2 ohms in the midband, rising slightly at either frequency extreme. My new design aims to equal or better this, with less rise at the extremes. I've not directly measured the output impedance of the prototype yet but for what it's worth I've stuck a 1 ohm resistor across the speaker with it playing with no noticeable reduction in output (apart from current limiting at higher levels at a very hot resistor in my hand!). Highly unscientific but tells me it's going to be a small fraction of a ohm. Well you’ve convinced me it won’t have any issues with 99.99% of speakers, |
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Post by radfordrevival on Mar 2, 2019 22:43:31 GMT
To be fair, in the case of the Radford, the output impedance is only around 0.2 ohms in the midband, rising slightly at either frequency extreme. My new design aims to equal or better this, with less rise at the extremes. I've not directly measured the output impedance of the prototype yet but for what it's worth I've stuck a 1 ohm resistor across the speaker with it playing with no noticeable reduction in output (apart from current limiting at higher levels at a very hot resistor in my hand!). Highly unscientific but tells me it's going to be a small fraction of a ohm. Well you’ve convinced me it won’t have any issues with 99.99% of speakers, That's the concept of this new amp - it should be able to drive most of anything. For those who like the idea and sound of valves but also want good measured performance! |
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Post by macca on Mar 2, 2019 23:16:15 GMT
I never understood that 'sound of valves' thing. There's so much variety between the sound of different valve amps.
And I've seen people mistook solid state for valve a few times. One was a bloke who has built many of both types.
Or does it mean that 'slightly soft with a bit of a glow' sort of thing? My experience of Radfords is they are not like that at all although they still remain pleasant on the ear tone-wise, as does any really good amp.
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Post by Bigman80 on Mar 4, 2019 6:29:28 GMT
OK, I can see a lot of stuff from all sides that has no place in a Radford Revival thread. Going forward can we keep all posts about the Radford Revival brand and its producrts, legacy, technology, performance etc. No other brand discussion (unless directly related and directly relevant) no fighting and nothing likely to lead to reported posts and admin action. FFS it’s beautiful kit. We shouldn’t have any controversy here.
I will now prune and before anyone even thinks of whining that their post got moved or deleted.......DON’T.
Edit: now pruned. Please let it grow into the shape of a Radford thread as it was designed to, and PLEASE: no more personal stuff. Oliver and I don’t want to be having to constantly admin and mend fences,
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Post by Deleted on Mar 4, 2019 15:10:12 GMT
OK, I can see a lot of stuff from all sides that has no place in a Radford Revival thread. Going forward can we keep all posts about the Radford Revival brand and its producrts, legacy, technology, performance etc. No other brand discussion (unless directly related and directly relevant) no fighting and nothing likely to lead to reported posts and admin action. FFS it’s beautiful kit. We shouldn’t have any controversy here. I will now prune and before anyone even thinks of whining that their post got moved or deleted.......DON’T. Edit: now pruned. Please let it grow into the shape of a Radford thread as it was designed to, and PLEASE: no more personal stuff. Oliver and I don’t want to be having to constantly admin and mend fences, Well said. S, |
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Post by sq225917 on Mar 4, 2019 23:00:53 GMT
I have to admit, I've never heard one. New or old.
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via Imgflip Meme Generator
via Imgflip Meme Generator
I have a set myself (basic mullard 5-20 circuit albeit at lower voltage and some foo military spec valves, bonus when your father in law builds himself a pair of amps in the late 50's and happens to work at a defence company)
