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Inspire by Dennis Had Enjoying Vacuum Tube Audio

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  #6441  
Old 06-03-2021, 08:45 PM
Bombadil Bombadil is online now
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Originally Posted by straitwire View Post
Hey Coltrane 1, just so you know, the unit listed on A'gon is a FireBottle KT88 SET.
So it's configured in Triode mode.
That's quite a good price on the A'gon unit. A $500 discount from new, including shipping and Paypal fees, for a unit which is claimed to have been turned on only 1 time and for 10 minutes.

Those opportunities don't come along often.
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  #6442  
Old 06-03-2021, 11:06 PM
Isaacc7 Isaacc7 is offline
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Originally Posted by straitwire View Post
Hey PaulInWA, Dennis designs the amp to be completely stable without a load or even a short across the output terminals.
No worries on your switch system.
I remember seeing Dennis talking at a dealer in norther VA decades ago. He claimed that he could pull the 211 out of the Cary 805 while it was playing and there wouldn't be any consequences. He goes to great lengths to protect the amps from us!
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  #6443  
Old 06-10-2021, 10:44 PM
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Coltrane1 Coltrane1 is offline
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Quote:
Originally Posted by Bombadil View Post
That's quite a good price on the A'gon unit. A $500 discount from new, including shipping and Paypal fees, for a unit which is claimed to have been turned on only 1 time and for 10 minutes.

Those opportunities don't come along often.
Darn, I missed it. I should of signed up for the email updates. ARGHHHH!
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  #6444  
Old 06-11-2021, 09:25 PM
Isaacc7 Isaacc7 is offline
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Not sure why my previous post asking about using the 7af7 didn't show up. In any case for the record you can use the 7af7 in the Firebottle Kt88 with an adapter. I don't think it sounds very good though. Sounded grainy, veiled, and rolled off. Pretty sure all of them were made by Sylvania so I doubt it matters which brand you buy.
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  #6445  
Old 06-17-2021, 11:16 PM
Isaacc7 Isaacc7 is offline
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Just popped in some cv124 tubes Ferranti tubes. I'm in love... Big, warm, lots of color. Anyone else using 807 tubes? These sound amazing, had some Russian ones from the 80s I think and they sounded terrible. Think I'm going to get some old RCA, Sylvania, etc. and give them a try.

Anyone use 6bg6? Seems like there are a ton of variations.
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  #6446  
Old 06-18-2021, 12:21 PM
Isaacc7 Isaacc7 is offline
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Hmm, been reading that the 807 can’t handle as much voltage on the screen as the 6l6c. What voltage are the screens set at on the kt88 firebottle?
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  #6447  
Old 06-18-2021, 06:31 PM
Bombadil Bombadil is online now
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Haven't tried any 807 or 6BG6, have read that the 6BG6 is almost identical to a 6L6GB. I have tried 6L6GB in a couple of my Inspire amps and they gave a very pleasant, warm'ish sound. Less high frequency detail and smaller soundstage, nice on vocals & midrange.

5881 sound similar.
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  #6448  
Old 06-18-2021, 10:51 PM
Isaacc7 Isaacc7 is offline
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I saw someone in this thread having trouble with some Mullard 807 tubes but he was using a 5ar4. I'm using a 5u4g so I'm hoping all will be well. Certainly haven't heard any problems yet.
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  #6449  
Old 06-19-2021, 06:06 AM
FloridaBoy FloridaBoy is offline
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Originally Posted by Isaacc7 View Post
I saw someone in this thread having trouble with some Mullard 807 tubes but he was using a 5ar4. I'm using a 5u4g so I'm hoping all will be well. Certainly haven't heard any problems yet.
Know your tube seller. There is a lot of untested 'NOS' junk out there.
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  #6450  
Old 06-20-2021, 11:45 PM
Isaacc7 Isaacc7 is offline
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Default Voltage questions when changing rectifiers

Straightwire, I think I read that the input tube's voltages don't really change as the rectifier changes because of regulation. I am curious what voltage those tubes get. I know that a variety of tubes work in that position but surely some will be more closely matched to the supplied voltage than others, right?

Do the output tubes see specific voltages on both the screen and plate for each rectifier? In other words, if we put in a 5ar4 we will get x on the plate and y on the screen but when we put in a 5u4 we get .8x and .8y? If so, I'm curious what x and y are.

I ask because the chart Dennis sent me is a little confusing. It shows that we can use either a 5ar4 or a 5u4 for the 6l6. Was he assuming that we were using a modern 6l6, which are all 6l6c or can we really use a 5ar4 with old 6l6a? He also listed a 606c tube in the same category as the 6f6 and 6v6 for power. I can't find any info about that tube, I assume it's a typo.

Thanks for any info you can share along these lines!
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