Dennis Had Inspire Amps

[jimi55]

Originally Posted by MWalt

I have a Dennis Had KT88 amp and an LP-2 preamp. My preamp came with 2 6189's (12AU7) and I cannot Identify the third tube. Anyone know which one it is?

I thought that preamp used 2 of a 6N1p and a 6CG7

[MWalt]

Thank you, Ivan.

[BearCityUSA]

Originally Posted by Musica Amantem

Nice amp! What are those output tubes: KT88's? Brand? Psvane rectifier ... which? A great weekend to you too!

The output tubes are Psvanes KT-88 IIs I have since sold. A few pages back here I posted less than glowing reviews. I'll have to look at the photo again ( not showing up on my tablet) and figure which rectifier I had in at the time.

[BearCityUSA]

Originally Posted by MWalt

I have a Dennis Had KT88 amp and an LP-2 preamp. My preamp came with 2 6189's (12AU7) and I cannot Identify the third tube. Anyone know which one it is?

What is the date on your LP2? Mine is an older model 2013 with a 6cg7 in back and 6922 up front. Yours looks like a 6cg7 like mine.

[jdandy]

MWalt.......Welcome to Audio Aficionado.

[pstrisik]

Originally Posted by BearCityUSA

What is the date on your LP2? Mine is an older model 2013 with a 6cg7 in back and 6922 up front. Yours looks like a 6cg7 like mine.

Interesting... Dennis has evidently changed the LP-2 design over time. He built mine in March 2014 and this was the description:

The LP-2 ( Line Preamplifier, second version) uses a pair of 6FM7's in the gain buffer stage with another 6FM7 in the DC high voltage circuitry. The rectifier is a 5Y3. The 6FM7 are a dual dis-similar triode vacuum tubes. One section is the equivalent of a 6SL7 for gain and the other section is a lower impedance 6SN7 for the current source output buffer.

[MWalt]

Originally Posted by BearCityUSA

What is the date on your LP2? Mine is an older model 2013 with a 6cg7 in back and 6922 up front. Yours looks like a 6cg7 like mine.

It is 10-22-2013

[MWalt]

I have read nearly every page of this thread and have not seen much reference to those that have used the 6L6GC power tubes. I was going through my tubes and found a pair of old school RCA 6L6GC Black Plates and decided to give them a go. This is a very articulate tube. Here is a photo of my amp with the RCA 6LCGC's, a pre Gorbachev 6N1P, and a Phillips 5R4GYS rectifier. Does anyone think I am stressing these power tubes out with the voltage from the rectifier? I would hate to ruin a pair of somewhat rare and expensive tubes.

[x3workshop]

I don't think they're in danger of being overdriven at all. That rectifier has a higher voltage drop than a 5U4GB.

Tube# - Base - Fvolt - Famp - Vdrop - MaxPmA - MaxPv - notes
5AR4/GZ34-5DA - 5.0 - 1.9 - 17 - 250 - 450 - low Vdrop 5U4/5Y3
5AS4-A - 5T - 5.0 - 3.0 - 50 - 275 - 450 - improved 5U4
5AT4 - 5L - 5.0 - 5.5 - 30 - 800 - 550 - higher power 5U4
5AU4 - 5T - 5.0 - 3.75 - 50 - 325 - 400 - high power 5U4
5AW4 - 5T - 5.0 - 3.7 - 46 - 250 - 450 - long life 5U4
5AX4-GT - 5T - 5.0 - 2.5 - 65 - 175 - 350 - high power 5Y3
5AZ3 - 12BR - 5.0 - 3.0 - 44 - 275 - 600 - compactron 5U4
5AZ4 - 5T* - 5.0 - 2.0 - 60 - 125 - 350 - loctal 5Y3
5BC3 - 9QJ - 5.0 - 3.0 - 53 - 300 - 500 - compactron
5CG4 - 5L - 5.0 - 2.0 - ? - 125 - 400
5DJ4 - 8KS - 5.0 - 3.0 - 44 - 300 - 600 - redesigned 5U4 (higher volts)
5R4-G/GY- 5T - 5.0 - 2.0 - 67 - 250 - 750 - high voltage 5U4
5R4-GYA - 5T - 5.0 - 2.0 - 67 - 250 - 750 - high voltage 5U4 (ruggedized)
5R4-GYB - 5T - 5.0 - 2.0 - 63 - 250 - 900 - high voltage 5U4 (ruggedized)
5T4 - 5T - 5.0 - 2.0 - 45 - 225 - 450 - metal 5U4
5U4-G - 5T - 5.0 - 3.0 - 44 - 225 - 450 - octal 5Z3
5U4-GA - 5T - 5.0 - 3.0 - 44 - 250 - 450
5U4-GB - 5T - 5.0 - 3.0 - 50 - 275 - 450
5V3 - 5T - 5.0 - 3.8 - 47 - 350 - 425 - higher power 5U4
5V3-A - 5T - 5.0 - 3.0 - 42 - 415 - 550 - 5V3 reduced filament current
5V4-G/GA- 5L - 5.0 - 2.0 - 25 - 175 - 375 - octal 83-V
5W4-G/GT- 5T - 5.0 - 1.5 - 45 - 100 - 350 - low power 5Y3
5X4-G - 5Q - 5.0 - 3.0 - 58 - 225 - 450 - 5U4 diff pinout
5X4-GA - 5Q - 5.0 - 3.0 - 47 - 250 - 450
5Y3-G/GT- 5T - 5.0 - 2.0 - 60 - 125 - 350 - octal 80
5Y4-G/GT- 5Q - 5.0 - 2.0 - 60 - 125 - 350 - 5Y3 diff pinout
5Z3 - 5T - 5.0 - 3.0 - 58 - 225 - 450 - 4pin 5U4
5Z4 - 5L - 5.0 - 2.0 - 20 - 125 - 350 - low drop 5Y3
80 - 4C - 5.0 - 2.0 - 60 - 125 - 350 - 4pin 5Y3
83 - 4C - 5.0 - 3.0 - 15 - 225 - 450 - 4pin mercury vapour
83-V - 4C - 5.0 - 2.0 - 25 - 175 - 375 - 4pin 5V4

[Musica Amantem]

"I have read nearly every page of this thread and have not seen much reference to those that have used the 6L6GC power tubes."

Well, welcome to the 6L6 GC club! I for one love the Russian 6L6 GC's with about everything, including running them when my preamp carries 56's: Plenty of detail, nice bass, no brightness whatsoever. I reported a few posts back that, to me, in my rig, this is the most resolving tube at hand. Thanks FloridaBoy for making me aware of the 6L6 GC. I'm ordering the Gold Lion KT66 hoping it will combine the traits of the 6L6 GC and the GL KT88.

I've run these beauties with every rectifier without any issues, so I would say the rectifier you're using is no problem. Those RCA's sure look great!