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Glass resistor mod and pairing amps in monoblock (Read 333 times)
mk60
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Glass resistor mod and pairing amps in monoblock
03/17/23 at 16:19:09  
I'm currently looking for a second SE84UFO25 to pair with my current one so that I can run them as monoblocks. My current unit has "glass" written on the label on the bottom of the unit, and it's also serial no. 35, so I assume that this means that it has the glass resistor upgrade that Steve used to offer with these.

Question: Would it be a bad idea to buy a second one that *doesn't* have the glass resistor upgrade if I'm going to run them together in mono? Will there be a mismatch in sonic signature?

(also if you have one and are thinking of selling soon, please do reach out!)
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I WOULD LIKE TO BUY YOUR SE84UFO25! Please PM me if you're looking to sell soon Smiley

Main System: Lumin U2 Mini->Denafrips Pontus II->Primaluna EVO 400 Integrated->Klipsch La Scala AL5 + 2x REL 212/SX
Office System: Naim Uniti Atom->Zu Dirty Weekend 6 Supreme
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bramar
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Re: Glass resistor mod and pairing amps in monoblock
Reply #1 - 03/17/23 at 17:59:47  
This is very anectdotal, it’s my loose understanding that Steve said the glass resistor is a barely audible mod.

If it were me, I wouldn’t sweat it.

Brad
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Main: Torii MK 5-25th, CSP3, ZRock2-25th, ZBIT, Bryston BDA-3 DAC+BDP-2 streamer, Ansuz conditioning, Brickwall 8, PI Audio diffusion, diy treats. 2nd system: Otomon Lab 300B, Cambridge CXNv2, Nola Boxer II/Audeze LCD-4, Norne Audio Silvergarde/ DHC1, DSR3, ZWire
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mperdue63
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Posts: 125
Re: Glass resistor mod and pairing amps in monoblock
Reply #2 - 03/18/23 at 11:11:59  
I have a pair of Anniversary amps configured in mono, one with glass mod, one without. There is not a noticeable difference that I can hear. Other differences between the amps are likely to be more apparent such as caps , volume control, etc. One of my amps has stepped volume and the other has smooth volume control and my CSP325 has dual volume control as well. Getting the volume or gain set is similar to operating a nuclear reactor control room during a meltdown! Extremely rewarding setup once you get it dialed in. I have a zrock in front of the CSP325 and I use it for volume changes.
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JBzen
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Re: Glass resistor mod and pairing amps in monoblock
Reply #3 - 03/18/23 at 12:51:59  
Interesting mperdue63 on your comment of the task of gain riding. Using the Zrock as a volume control after setting the pre and amps seems like a good move.

In my case, the amp has no volume control. The Zbox and Csp2+ are the means of setting gain riding in the system. Been using the Cps2 main dual gang pot control to adjust volume. Have to give using the Zrock as a volume control after setting the others for general optimum performance a try.

Thanks Wink

John
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AMC CD8b>XO3>Cambridge CXN2>ZDAC>ZBOX>braided silver/occ> Zrock2>CSP2+>SE84 milflex copper 25th>9AWG silver/copper braid>lii Crystal 10 in Huijgen cabinets. Ortofon 2M Bronze>JVC QL-F4>ZP3>Isolation-AC filtering-Room treatment. Otari MX5050B2.
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mperdue63
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Re: Glass resistor mod and pairing amps in monoblock
Reply #4 - 03/18/23 at 12:58:58  
John,
I meant to say I use a ZBit to control volume, not a ZRock
Posting to early in the morning, lol
Malcolm
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mk60
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Re: Glass resistor mod and pairing amps in monoblock
Reply #5 - 03/18/23 at 22:49:02  
Oof good point. The UFO25 I have is stepped, and it would be super convenient if the one I got to pair was also stepped volume. If not, I'd be tempted to just put both on max gain and attenuate with a pre, or the "lossless" digital vol control on my streamer.
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I WOULD LIKE TO BUY YOUR SE84UFO25! Please PM me if you're looking to sell soon Smiley

Main System: Lumin U2 Mini->Denafrips Pontus II->Primaluna EVO 400 Integrated->Klipsch La Scala AL5 + 2x REL 212/SX
Office System: Naim Uniti Atom->Zu Dirty Weekend 6 Supreme
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