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-   Inspire by Dennis Had (https://www.audioaficionado.org/forumdisplay.php?f=184)
-   -   Dennis Had Inspire Amps (https://www.audioaficionado.org/showthread.php?t=24170)

C10 05-06-2022 12:25 PM

Quote:

Originally Posted by Masterlu (Post 1059931)
C10Ö Welcome to AA! :wave:

Thank you!

C10 05-06-2022 12:25 PM

Can't wait for this!

roller 05-08-2022 03:12 PM

Quote:

Originally Posted by jsbw (Post 1059855)
I've purchased a few "backup" tubes here and there (had a Mullard 5ar4 display a pleasing, brief lightning storm within it's glass not too long ago), and since the wife was out of town, I thought I'd sit down and audition every tube combination I have, and rate them. Interesting results:

https://docs.google.com/spreadsheets...it?usp=sharing

Wow, youíre quite a bit more organized than I am lol. Iíve been obsessed with trying as many combos as possible and have kept records of combos Iíve liked. I have not put ratings in different categories though.

Isaacc7 05-09-2022 11:18 PM

Last time I was here I asked about using 6aq5 tubes. I went ahead and got some and I'm happy to report they work just fine and can sound great! I use a 5y3 rectifier in my kt88 firebottle to get the voltage down where it needs to be. I was a little worried about the screen voltage, the 6aq5 is only rated to 250 volts on the screen. I believe the firebottle puts 260 volts on the screen. Some other folks have assured me the 10 volts shouldn't be a big deal. So fr so good...

I have listened to Brimar, Mullard, and a French brand Miniatron. Also have some Telefunken as well but have not fired those up yet.

Isaacc7 05-11-2022 07:54 PM

@straitwire or anyone else that may know, what is the power transformer on the Firebottle KT88 rated for? I know it's pretty beefy but wonder if it can handle output tubes that draw 2 amps for the heater. I'm guessing not but figured I'd ask.

Analog Addict 05-12-2022 02:57 PM

Quote:

Originally Posted by Isaacc7 (Post 1060318)
@straitwire or anyone else that may know, what is the power transformer on the Firebottle KT88 rated for? I know it's pretty beefy but wonder if it can handle output tubes that draw 2 amps for the heater. I'm guessing not but figured I'd ask.

What tube compliment are you planning on trying? List them all please, including the rectifier

Analog Addict 05-13-2022 11:01 AM

Well, as usual, Dennis has been monitoring the thread and has relayed to me that the filament winding on the Firebottle KT-88 power transformer is rated at 6 amps, or in other words, will run ANY tube compliment you can stick in there.

He also reiterated that Inspire amps can be run 24/7/365 without any concern for the capabilities of the transformer. You essentially need to worry more about your tubes than the amp itself...:smoking:

Isaacc7 05-13-2022 09:42 PM

I had ordered some N34 tubes for an amp coming to me this year and by accident/miscommunication I also got some N43 tubes. The 2 amp heater is what jumped out at me so I asked my question about the power transformer. Looking a little more closely they have a 4v filament so I won't be using the anyway lol. There's no way to make an adapter to make those work right?

Still, it's good to know that the transformer can provide 6 amps. Though I might be at the end of my tube rolling journey with this amp. The GE 6bg6ga and Raytheon 6f8g combo is an amazing combo. That and the cv1102 with el38 combo are my go to combos. I still have a few other tubes to listen to like the Telefunken 6aq5 but it's hard to have patience with new combos when you have stuff that you know sounds great.

Analog Addict 05-17-2022 09:30 AM

Quote:

Originally Posted by Isaacc7 (Post 1060427)
I had ordered some N34 tubes for an amp coming to me this year and by accident/miscommunication I also got some N43 tubes. The 2 amp heater is what jumped out at me so I asked my question about the power transformer. Looking a little more closely they have a 4v filament so I won't be using the anyway lol. There's no way to make an adapter to make those work right?

Still, it's good to know that the transformer can provide 6 amps. Though I might be at the end of my tube rolling journey with this amp. The GE 6bg6ga and Raytheon 6f8g combo is an amazing combo. That and the cv1102 with el38 combo are my go to combos. I still have a few other tubes to listen to like the Telefunken 6aq5 but it's hard to have patience with new combos when you have stuff that you know sounds great.

Personally I wouldn't say you are at the end of the journey until you've also listened to some of the old standards, like US made Tung Sol or GE 6550s, or their British KT 88 counterparts. Yes they are expensive to buy, but if you have other toob rolling friends, they can always help you out with a loan or bring some by for a listening session.

I do this with Dennis all the time....

Isaacc7 05-17-2022 06:14 PM

Quote:

Originally Posted by Analog Addict (Post 1060643)
Personally I wouldn't say you are at the end of the journey until you've also listened to some of the old standards, like US made Tung Sol or GE 6550s, or their British KT 88 counterparts. Yes they are expensive to buy, but if you have other toob rolling friends, they can always help you out with a loan or bring some by for a listening session.

I do this with Dennis all the time....

Yeah, Iím getting close to the end. Iím not going to pony up the money for real kt88, kt66, or ecc32 tubes. As it is Iím plumbing the depths of alternative options. I had never heard of the bl63 tubes but Iím glad I found them. While I havenít had the chance to hear American 6550 I havenít been impressed with the kt88 and 6550 I have heard. Plus, hearing a tube I donít want to pay for would be the ultimate tease lol.

I do wish I could get a Firebottle KT88 with a 12v option, at least for the input tube. Iíve ordered a PP amp from another guy that will allow me to use 6v or 12v on either input or output tubes. Iíve already got a selection of 12sn7 tubes for my preamp including black glass round plate Tungsol and the so called bad boy Sylvania tubes. They live up to the hype:) Iím not about to pay the price for the 6sn76 equivalents though.


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