Rose RV-23 preamp valves. $xECC82, or 2xECC82 + 2xECC83?

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adrian
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Rose RV-23 preamp valves. $xECC82, or 2xECC82 + 2xECC83?

Post by adrian » Mon Dec 05, 2016 3:18 pm

Hi all

long time no post. Hello again!

there's a little confusion on the web and I would like to know which new valves to buy to spruce up the 2nd hand Rose I recently bought. It has 4 x ECC82, but I have read that the phono section should be ECC83. Meanwhile I have a 2nd Rose with 4 x ECC81 (which seems to be ok but for a slight rustle on one channel (albeit that in the same channel one of the valve flares mightily on turn-on).

Any comments gratefully received

Best

Adrian

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pre65
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Re: Rose RV-23 preamp valves. $xECC82, or 2xECC82 + 2xECC83?

Post by pre65 » Mon Dec 05, 2016 3:53 pm

Best of luck with the search, there is very little on the interweb.

I lusted after one of these many years ago.

Check for cracked PCB, seems something on the board fouls the lid.
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Greg
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Re: Rose RV-23 preamp valves. $xECC82, or 2xECC82 + 2xECC83?

Post by Greg » Mon Dec 05, 2016 6:02 pm

Hello Adrian. The flaring valve is quite normal on certain types by certain manufacturers. A pair did this on my first build, a WD KaT88. Very alarming at the time of first switch on :roll:

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Re: Rose RV-23 preamp valves. $xECC82, or 2xECC82 + 2xECC83?

Post by Mike H » Tue Dec 06, 2016 7:09 pm

ECC81, ECC82 and ECC83 are each quite different designs with different characteristics, biasing, max. ratings etc., DO NOT swap one type for another.
 
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adrian
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Re: Rose RV-23 preamp valves. $xECC82, or 2xECC82 + 2xECC83?

Post by adrian » Thu Dec 08, 2016 9:52 pm

Phil, Greg and Mike

thanks for the replies. Phil, yes, Gerry mentioned the same thing a while ago on some forum or other. The problem of the cover pressing on the heat-sink does not affect my amp happily.
Greg, the flaring is odd as it affects all valves in one of the 4 bases, but not any of the others. All valves flare in that one position when I swap them around, suggesting a circuit problem. Further investigation required.
<ike, oddly, all the ECC81/82/83s seem to play ok in this circuit, and I can't hear differences between them. It doesn't make much sense, but there you go. Meanwhile, I will stick with 82s in line circuit and get 83s for the phono

Adrian

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Re: Rose RV-23 preamp valves. $xECC82, or 2xECC82 + 2xECC83?

Post by Gerry » Sun Mar 18, 2018 9:42 pm

Long time Adrian..... But
Is it a RV23SE or a plain RV23? The RV23SE has a separate PSU (transformer) . If so 4x ecc81, if not it is the the mix. Sean messed around a bit with valves in various models. I have some paperwork/old emails from him.
Regards
Gerry

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