[Dual rectifiers?]

Many thanks for all of the responses. 

[Dual rectifiers?]

Jeff:

 

Is it actually lowering the resistance too...which would have the combined effect of lowering the voltage. I’m possibly not following what you’re saying. 
 

thanks 

[Dual rectifiers?]

In the hope of learning more about tube HiFi, what is the rationale for having two rectifier tubes in a circuit? Is this more prevalent in SET amps?

 

(I know that some - particularly Mesa Boogie - guitar amps have two rectifiers, but it is not at all common.) 

 

Thanks for any wisdom on the matter. 

[Phono stage: lower noise 12AX7 replacements?]

Well, I replaced the JJs in my phono stage with those 7025s and I actually like the tone a bit better. Having said, that did not get eliminate any of the hiss.

 

After trying every imaginable combination of tube vs solid state for phono stage, preamp and power amp, it’s pretty clear that the culprit is phono with my PrimaLuna Prologue Four. I swapped in some newer 12ax7s in that and that didn’t help at all.  
 

Maybe the transformers in the amp don’t like phono? 

[Softone Model 8 300B integrated. Ping Jeff Medwin]

On 2/9/2020 at 7:29 AM, Les Lammers said:

I have been looking at this amp for a few years. http://softone.a.la9.jp/english/Model8/M8-eng-1.htm The circuit looks interesting and unique. Thoughts?

Did you ever end up getting this? 

[Phono stage: lower noise 12AX7 replacements?]

2 hours ago, jimjimbo said:

If you need tubes, let me know.

I thinking about these; $15 from tube depot (and I just need three). 

 

https://www.evatco.com.au/the-new-eh-7025/
 

have you tried them? 

[Phono stage: lower noise 12AX7 replacements?]

Many thanks for the advice. 

[Phono stage: lower noise 12AX7 replacements?]

That’s an open question. 😀

 

my cursory reading on the matter indicated the other two are good choices. 

[Phono stage: lower noise 12AX7 replacements?]

Hi

 

i have some unwanted hiss in my system, which  I have isolated to the phono stage. I have some 9 month (age of the phono stage) old JJ 12AX7s in there now, but I don’t think it’s indicative of a problem with any of them.

 

If I were to swap in some 5751s or 7025s, which would likely be better for a phono stage?

 

Thanks

[My First Tube Amp PL Dialogue 5]

I’m using the 4 ohm tap on my PL power amp with wharfedale Denton 80 speakers. It’s magic. 

[Primaluna evo 400 Integrated Amp?]

I’ve live with a PL Prologue Four power amp for about 6 weeks and it’s fantastic. It’s my first tube power amp, so no real point of reference, but wow. 

[Mono Hi-Fi at its best]

Listening to a mono pressing of this right now.

[Primaluna evo 400 Integrated Amp?]

1 hour ago, Fido said:

My Vincent had a hum problem which many people claimed was a common occurrence. I think I could have trouble shooted it more with a NULL plug perhaps but didn't want to deal with troubleshooting it so I traded it in for a MUSICAL FIDELITY MX-VYNL PHONOSTAGE and it sounds fantastic with no hum at all - best phonstage I have ever owned and at Upscale Audio it was only $150 more than the Vincent

by NULL caps, do you mean RCA caps?

[Is bi-wiring worthwhile? (not bi-amping)]

Any onclusions to draw from this thread? 😉

 

 

I have some Wharfedale Denton 80s. Great speakers, btw!

 

They have two sets of binding posts, but I’m baffled as to how bi-wiring could make a difference.

 

if someone can sell me on the idea, please do. 😀

 

 

 

[What the Hum Is Going On Here?]

What’s the efficacy of a ground loop isolator in this type of  situation

[Affordable single ended tube amp]

On the subject of single ended amps, any recommendations on a kit? A common one seems to be Douk, but have some reservations after reading various threads around the web.

 

thanks 

[Tube Newb Question....12AX7 and 12AX7A]

8 minutes ago, kevinmi said:

I used 5751's instead of 12ax7's for years in my phono stage. A little less volume, but a lot quieter.

 

Any discernible tone difference? 

[Tube Newb Question....12AX7 and 12AX7A]

Since this thread was unearthed...

 

I saw folks mentioning using a 5751 for 12AX7.  Is that really a good idea and what’s the expected result? 

[Newbie to the Tube Amp]

What’s your max budget number? 

[Newbie to the Tube Amp]

Integrated or power amp? 

[Boyuu tube amps]

19 minutes ago, LTusler said:

I have a Tube Cube 7.  Its a great little amp.

I was thinking about getting one for fun, but just noticed that they are out of stock; presumably made in China...

[Boyuu tube amps]

Another option to get your feet wet is the Tube Cube:

https://www.tubedepot.com/products/tubecube-7-stereo-vacuum-tube-amplifier
 

It’s only 3.5 wpc, by you might find yourself getting the tube bug and wanting to make a major upgrade. I question whether any of those amps you listed have any resale value. 

[tube techs or hobbyist willing to do mod ?]

I’m assuming there aren’t any “stereo doctors” near you.

 

How about a well tech, who repairs tube guitar amps? 

[Softone Model 8 300B integrated. Ping Jeff Medwin]

Anyway...others with an opinion on the Decware amps? Maybe I’ll try the forum search. 🤔

[Softone Model 8 300B integrated. Ping Jeff Medwin]

“Triode amps such as the Model 8,  using global negative feedback are also boring to hear, continuously playing music back, out-of-time. Are we building SE amps, or, are they SE tuners ??  E.E.s are trained in their classrooms,  to add negative feedback loops to SE all-triode amps.  Discriminating music-lovers will RIP THEM OUT !!”

 

Jeffrey, given the above, what is your take on Decware amps?