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AUDIO FORUMS >> Replacement Tubes >> Torii MK V Voltage Regulator Tubes
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Message started by Sai on 02/18/24 at 22:44:54

Title: Torii MK V Voltage Regulator Tubes
Post by Sai on 02/18/24 at 22:44:54

Wanted to ask if folks have tried a 75C1 on their Torii MK V? What is to be expected? Currently use a pair of Brimar OA3 tubes, also used the Sylvania OA3 pair Steve sent the amp out with…

Also, what have folks experienced using the OB3, OC3, and OD3??

Title: Re: Torii MK V Voltage Regulator Tubes
Post by Dominick on 02/19/24 at 01:25:15

Hey Sai,

I had just received NOS Philips 75C1 regulator tubes from Serbia like two weeks ago. I’ve been planning to try them out, but I’ve been busy playing playing with the capacitors in my Err’s and Pinnacle speakers. I will try them in my Torii MKIV 25th in the next week or so.

I promise that once I roll them in, I will report back. Right now I am running the stock Decware OC3 tubes.

Dom

Title: Re: Torii MK V Voltage Regulator Tubes
Post by Sai on 02/19/24 at 03:08:46

Much appreciated Dom! Looking forward to it…

Title: Re: Torii MK V Voltage Regulator Tubes
Post by Dominick on 02/20/24 at 04:05:11

No problem. If for some reason I don’t reply back…shoot me a PM to check in.

Title: Re: Torii MK V Voltage Regulator Tubes
Post by Sai on 02/20/24 at 04:57:09

Will do! Thanks again.

Title: Re: Torii MK V Voltage Regulator Tubes
Post by Dominick on 03/06/24 at 22:17:04

Hey Sai,

Just threw in my Philips 75C1 VR tubes in my MKIV for the first time. I didn’t know what to expect, but I have to say I they are pretty good. They sound a bit thick and are bolder than the stock OA3’s. I would say they are a tad slower, but not necessarily bad. So far I am liking the sound even though it’s a bit different.

My Torii is hooked up to my Pinnacle bookshelves right now, and not my Err’s. The Pinnacle’s don’t have the range or the depth that Err’s do, so at some point I’ll have to swap them out to get a better grip on the tubes. But last night I had the Torii playing for like 3 hours, so I would say I have good feel on the difference between the OA3’s and the 75C1’s.

The 75C1’s need more time before I can give you a fair comparison, but this is just what I’m hearing now. I hope this helps.

Dom

Title: Re: Torii MK V Voltage Regulator Tubes
Post by GroovySauce on 03/06/24 at 23:30:29

Isn't the 75C1 a 7 pin and the MK V takes octal?

MK IV takes both 7 pin and octal VR tubes.
MK V takes a pair of octal VR tubes.

Sai, I've been getting a lot of tubes ready to be sold. If you want to try a few different 0_3 tubes. Mostly "A"s a few B and Cs. Maybe a pair of Ds.

I have a slew of Westinghouse 0A3.

Title: Re: Torii MK V Voltage Regulator Tubes
Post by Dominick on 03/07/24 at 01:39:57

Nigel,

Yes the 75C1 is a seven pin. I didn’t know that the MKV takes an octal…good to know.

Speaking of the Westinghouse…. I had bought from Steve years ago a pair of Westinghouse VR75 that were in limited supply. Only one set was allowed to each customer, and they were gone within like two days. I’ve been meaning to throw them in. How do you like them?

Dom

Title: Re: Torii MK V Voltage Regulator Tubes
Post by GroovySauce on 03/07/24 at 16:28:09

The Westinghouse 0A3 were my favorites in the MKIV and MKV. The VR tubes same spec different manufacture are a more subtle change vs. other tubes in my experience.

Title: Re: Torii MK V Voltage Regulator Tubes
Post by Sai on 03/08/24 at 05:08:04

Thanks for the initial impressions Dom!

GroovySauce, I would be interested in a pair of Westinghouse OA3 tubes if you’re parting with any…

on a separate note my Torii is headed back to Steve for TLC. Bad 807 to 6L6 adapter fried something in the amp on the right channel’s front output tube’s circuitry :(

Title: Re: Torii MK V Voltage Regulator Tubes
Post by GroovySauce on 03/08/24 at 14:39:21

Sai, OUCH! Hope they can turn it around quickly for you. I just read a thread about the same thing that happened to someones Lampizator DAC.

Sai, I'll shoot you a PM

Title: Re: Torii MK V Voltage Regulator Tubes
Post by Dominick on 03/10/24 at 01:04:42

Sai….your welcome! I’ve had the Torii fired up a few more times since my last post, and the sound is for sure a thicker presentation. Jury is still out, but I think I like it. Sorry to hear about the issue with the bad tube adapter frying the output circuitry. I’m sure Steve will go over the whole amp to make sure that nothing else was affected.

Groovy….So the Westinghouse are your favorite OA3’s. Cool. I guess it’s about time to throw them in and hear what I have been missing. I’ll have to report back one day this upcoming week. Steve had raved about them back when I bought them a few years ago…so that’s not surprising.

Dom

Title: Re: Torii MK V Voltage Regulator Tubes
Post by Sai on 03/10/24 at 06:13:50

Thanks Dom. Yep, she’s back at Decware as of today. Hoping it’s something small/quick. I have no doubts that Steve will get her singing again…

Title: Re: Torii MK V Voltage Regulator Tubes
Post by GroovySauce on 03/10/24 at 14:43:56

Dom, Yep loved the Westinghouse in the the MKV.

In the UFO25th it was a toss up between the Cryotone and Westinghouse.

Title: Re: Torii MK V Voltage Regulator Tubes
Post by Dominick on 03/10/24 at 22:02:21

I’ll report back after I give the Westinghouse a good listen.