What tubes do you plan to use in your DHT?

TomS · « **Reply #180 on:** 27 Mar 2018, 12:05 am »

Quote from: FullRangeMan on 27 Mar 2018, 12:03 am

He mean say 2A3 is a 2.5V tube and 300B is a 5V tube.
Not sure if the equip have a 2.5/5V option.

Yes it does

FullRangeMan · « **Reply #181 on:** 27 Mar 2018, 12:09 am »

Just see in the site:
Proprietary slide-switch “convertible” design compatible with: 2A3 / 45, 300B, PX4 / PX25, 101D / 205D

Vinnie R. · « **Reply #182 on:** 27 Mar 2018, 12:30 am »

Quote from: jhrlrd on 26 Mar 2018, 11:32 pm

I realize what the stock tubes are.
Is it a waste of $200 to try the EH 300b ?

Hi jhrlrd,

It would only be a waste of money if you didn't like the sound of the EH 300B. It is really a matter of taste
and system synergy.

If I was in your position, I'd probably just save up for a set of KR PX4's

Best regards,

Vinnie

jhrlrd · « **Reply #183 on:** 27 Mar 2018, 01:34 am »

will do, thanks Vinnie

lutry · « **Reply #184 on:** 15 Jun 2018, 08:52 pm »

Hello everyone,
Some advice please: I'm about to receive my upgraded Lio with the DHT and after reading all the KR PX4 positive reviews I contacted best300b.com to order a pair. They replied commenting that there is an updated version called Riccardo Kron Limited Series which according to them it's better in "everyway" because of the following updates:
- Improved structure support in the least vibrating glass points with double mica
- Ceramic bases
- Gold plated base pins
- Triple thickness glass
- Doubled cooling radiation surface for anode cooling
- Barium heaters that run colder and have better emission
- Closer tolerance matching
- 9th degree of vacuum for extended longevity[/li][/list]

All of these for an extra +500USD. Have any of you had the opportunity to try this updated version? In case not, do you think these list of improvements would justify the additional cost?

Many thanks for the advise!
Lutry

Vinnie R. · « **Reply #185 on:** 16 Jun 2018, 01:48 am »

Hi lutry,

I have not yet listened to this special edition KR Audio "Riccardo Kron Limited Series" PX4 (and I'm not sure if anyone
who owns LIO DHT PRE has).

At some point I hopefully will and then I'll report back.

I'm not sure if the added measures they took for added longevity will matter much in LIO DHT PRE, as used in the preamp
it is not being driver hard at all (compared to if it was used in a power output stage). But the ceramic bases, thicker glass,
and Barium heaters might have some change in how they sound compared to the standard KR PX4.

Best regards,

Vinnie

FullRangeMan · « **Reply #186 on:** 16 Jun 2018, 02:46 pm »

Hi Lutry,
Do you mind ask they how much is the Triple thickness glass?
SMT with these upgrades KR do for mod 500 bucks/each $1000 pair will reduce vibrations and microphony, unless Barium heaters that run colder and have better emission will lasts much more years, for this price they should.

mcanaday · « **Reply #187 on:** 18 Jun 2018, 07:13 pm »

Does anyone have suggestions for US vendors to buy the KR PX4s from?

Also are they better with or without tube dampers?

Thanks!

Margot

jriggy · « **Reply #188 on:** 18 Jun 2018, 10:48 pm »

Overseas purchase may be the only option —dont know...
But I can tell you that I much preferred them without tube dampeners in the LIO.

Vinnie R. · « **Reply #189 on:** 20 Jun 2018, 08:36 pm »

Quote from: mcanaday on 18 Jun 2018, 07:13 pm

Does anyone have suggestions for US vendors to buy the KR PX4s from?

Also are they better with or without tube dampers?

Hi Margot,

Ordering from www.best300b.com in Poland has been a good experience so far. If they have 'em in
stock, they should be fairly quick to ship to the USA.

I would run them w/o the dampers, but if you already have dampers that fit, then give 'em a try.

Vinnie

mcanaday · « **Reply #190 on:** 24 Jun 2018, 04:57 pm »

Great, Vinnie. Thank you! Excited to try them.

Timbana · « **Reply #191 on:** 28 Jul 2018, 03:40 pm »

This article discusses several KR Audio DHTs that may be worth investigating. http://hifiknights.com/reviews/sources/lampizator-pacific-the-glassy-story/

I've been using the standard KR PX4s in my LIO, and prefer this tube to the stock tubes or EML Mesh Plate 300Bs I've tried. This article compares the new, limited edition KR PX4s with limited edition KR 300Bs and a few other tubes, all in a Lampizator DAC. The comparison also includes a tube I haven't previously heard about, a KR T-100 . . . and the author seems to prefer it to the others. I have a couple of questions: 1) Has anyone compared any of these tubes in the LIO, and 2) Vinnie - Is the T-100 suitable for use in the DHT module?

Vinnie R. · « **Reply #192 on:** 28 Jul 2018, 04:45 pm »

Hi Timbana,

I have not tested the KR T-100 in the LIO DHT PRE or L2 Signature Preamp yet.

The filament requirement of 5V, 2A is no problem. You would use the 5V setting on the filament switches.
Looking at the data of this tube on the KR site, it appears it should work fine. But I don't want to recommend
it until I first test it on the bench and carefully listen to it.

Quote

1) Has anyone compared any of these tubes in the LIO

This is a good way to ask the question, because feedback from those who heard these tubes in a different component
(e.g. Lampi dac) may not be helpful in detailing how they compare in a different circuit such as the LIO DHT PRE, and
vice versa.

I'll be doing more DHT comparisons this fall, and plan to bring a few different ones to RMAF in October.

Vinnie

decur · « **Reply #193 on:** 28 Jul 2018, 06:19 pm »

So,
Im a huge kr px4 fan,wow what a great read on the kr t100! This tube sounds like something i would really enjoy.
Hmmmm

Vinnie R. · « **Reply #194 on:** 28 Jul 2018, 06:34 pm »

Quote from: decur on 28 Jul 2018, 06:19 pm

So,
Im a huge kr px4 fan,wow what a great read on the kr t100! This tube sounds like something i would really enjoy.
Hmmmm

Hi decur,

Me, too!

Based on its data, the KR T-100 it should work fine. Not sure about hum pickup, but since you are planning to upgrade to the L2 Preamp,
hum is not an issue with any of the DHTs I've tried so far in the new L2 circuit.

Even the Psvane WE 101 replicas are quiet in the L2 Preamp (and they had the worse hum in the DHT PRE out of all the tubes I tried).

Vinnie

Vinnie R. · « **Reply #195 on:** 11 Aug 2018, 02:23 am »

I should have a matched pair of KR T100 to begin evaluating next weekend...

These are big boys!

Vinnie

decur · « **Reply #196 on:** 11 Aug 2018, 11:21 am »

Looking forward to hearing them vinnie

mcanaday · « **Reply #197 on:** 13 Aug 2018, 04:31 pm »

Yes, following this with interest! Would love to know how they work in the LIO as compared to KR PX-4 Thank you, Vinnie! Cheers, Margot

Vinnie R. · « **Reply #198 on:** 16 Aug 2018, 03:48 pm »

Quote from: mcanaday on 13 Aug 2018, 04:31 pm

Yes, following this with interest! Would love to know how they work in the LIO as compared to KR PX-4 Thank you, Vinnie! Cheers, Margot

All,

They have arrived!

The KR T-100s are nearly 7 inches tall (not including the pins) and 2.3" diameter!

I can't wait to give them a listen over the weekend.

More soon...

Vinnie

Timbana · « **Reply #199 on:** 17 Aug 2018, 03:36 am »

Quote from: Vinnie R. on 16 Aug 2018, 03:48 pm

All,

They have arrived!

The KR T-100s are nearly 7 inches tall (not including the pins) and 2.3" diameter!

I can't wait to give them a listen over the weekend.

More soon...

Vinnie

. . . and I can't wait to hear how they compare to the KR PX4s