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Inspire by Dennis Had Enjoying Vacuum Tube Audio

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  #2281  
Old 09-09-2016, 11:41 AM
pstrisik pstrisik is offline
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Tube rolling note:

In my Inspire SEP I have settled on 1960's Mullard EL-34 Xf2 output tubes as my current favorites. Expensive and hard to find good examples these days without being really expensive. So I ordered a pair of current production Mullard EL-34's that are Russian made and modeled after the original Xf2's. Only $46/pair shipped. We'll see how they compare. Would be nice if they do the job.
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  #2282  
Old 09-09-2016, 12:01 PM
Rosco65 Rosco65 is offline
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Originally Posted by Analog Addict View Post
Here are the notes Dennis took on the Hot Rod amp. Columns are Bias Voltage, Bias current calculated using Ohm's law and a bias resistor of 360 ohms, and maximum output wattage...



He also told me about the change to use directly heated rectifiers, but I don't know any more at this point....
AA - is this all with the same 5V4 rectifier tube? Does the power output change with other rectifiers?
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  #2283  
Old 09-09-2016, 12:10 PM
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Those measurements should be all with the 5V4 because they are several days old. Power output shouldn't change since the voltage drop associated with the rectifiers still leaves the resultant voltages above the regulated level. However, as previously noted, the sound quality may change. And Dennis has experimented with motorized volume control, but I don't know if it's ever been incorporated into a pre amp....
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  #2284  
Old 09-09-2016, 03:17 PM
Rosco65 Rosco65 is offline
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Interesting. This PS in a PSE should result in a legit 25W PSE KT88 amp, 20W 6L6, or 10-14W 6V6 amp.
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  #2285  
Old 09-09-2016, 04:00 PM
Comzee Comzee is offline
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I searched the thread and didn't see anybody using these, but I found what looks like it could be gem: "Melz hole plate 6N8S"

Anybody using that, impressions?

I also recently picked up a Mullard f31 fat base 5v4g, also some tung-sol 3 hole plates based on that "hot-rod" impressions earlier back.

I bought some nos 2 hole bottom getter 6sn7, but what I'm thinking is this.


Tung-sol 3 hole + Melz 5 hole + Mullard f31 = potential magic?

If the Mullard doesn't cut it, maybe I'll get a Princess 274B mesh....

I also just passed the price of the amp, in all the tubes I've bought, I think I have a problem

fyi my amp is the "fire-bottle" version
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  #2286  
Old 09-09-2016, 04:36 PM
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BearCityUSA BearCityUSA is offline
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Quote:
Originally Posted by Comzee View Post
I searched the thread and didn't see anybody using these, but I found what looks like it could be gem: "Melz hole plate 6N8S" Anybody using that, impressions? I also recently picked up a Mullard f31 fat base 5v4g, also some tung-sol 3 hole plates based on that "hot-rod" impressions earlier back. I bought some nos 2 hole bottom getter 6sn7, but what I'm thinking is this. Tung-sol 3 hole + Melz 5 hole + Mullard f31 = potential magic? If the Mullard doesn't cut it, maybe I'll get a Princess 274B mesh.... I also just passed the price of the amp, in all the tubes I've bought, I think I have a problem fyi my amp is the "fire-bottle" version
In anticipation of picking up my PSE on the 26th from Dennis, I ordered the Melz 6n8s and coincidentally it came in today. I will have to let you know in that my KT model runs a 9 pin driver. The excitement does make it hard to sleep sometimes.
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  #2287  
Old 09-09-2016, 05:06 PM
Comzee Comzee is offline
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Originally Posted by BearCityUSA View Post
In anticipation of picking up my PSE on the 26th from Dennis, I ordered the Melz 6n8s and coincidentally it came in today.
Nice!

I looked for awhile for the 5 hole plate version, only North American seller was trying to sell it for $175......

Picked it up from a Ukraine seller for $75, now I wait four weeks
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  #2288  
Old 09-09-2016, 05:10 PM
Musica Amantem Musica Amantem is offline
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Originally Posted by robert_kc View Post
Based on recommendations by Musica Amantem, I have the following in transit to me: 1980s “NOS Matched Pair USSR Reflector 6P3S-E / 6L6GC / 6N3C Military Spec Vacuum Tubes”, from a USA seller who tested the tubes on a calibrated Hickok TV-7 D/U tube tester. More to follow …
Could you kindly report your impressions on the Russian 6P3S-E, and are these the ones with the golden pins? Also, have you tried KT66's in your amp (I can't recall if you listed that one in your tube-rolling). Thanks!
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  #2289  
Old 09-10-2016, 09:46 AM
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Has anyone heard Tonian speakers? The ones with Phy 12" drivers and Tonian ribbon tweeters.

Last edited by timeout59; 09-10-2016 at 10:36 AM.
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  #2290  
Old 09-10-2016, 02:04 PM
Musica Amantem Musica Amantem is offline
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Originally Posted by Musica Amantem View Post
Could you kindly report your impressions on the Russian 6P3S-E, and are these the ones with the golden pins? Also, have you tried KT66's in your amp (I can't recall if you listed that one in your tube-rolling). Thanks!
Sorry, I just found your post with your preferred output tubes. The 6P3S-E from the 80's is slightly different from mine from the 70's and do not have gold pins. Interesting choice the Groove Tube Gold Series GT6L6GE (6L6GC), had never heard of those before. These look slightly larger than mine.

EXCLUSIVE GT design. The GE is a faithful reproduction of the original “clear top” 6L6. The flagship of the GT 6L6 line, it looks and sounds exactly like the original
G.E. tube used by Fender® in the ‘50s and ‘60s. It took more than four years to develop, and has stunning clarity and power. Our most recommended 6L6.

Single 6L6 tube in “medium” power range. 555-0113-682 $39.99
Matched pair of 6L6 tubes in “Medium” power range 555-0113-503 $79.99
Matched quartet of 6L6 tubes in “medium” power range. 555-0113-506 $159.99
Matched sextet of 6L6 tubes in “medium” power range. 555-0113-539 $239.99


I've noticed people are using the 5V4/5V4G/5V4GA variants in the rectifier position. The closest I've been to those is my Brimar 5Z4 GY which is second choice for me against the trusty SE 274B MP. Can I use the 5V4 variants without issues in my Inspire KT88 SET with oversized (20 watts) transformers? Thanks to anyone offering feedback.

Last edited by Musica Amantem; 09-10-2016 at 02:57 PM.
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