Rozenblit 300B SEOTL 1.5W

What people are working on at the moment
Cressy Snr
Amstrad Tower of Power
Posts: 10552
Joined: Wed May 30, 2007 12:25 am
Location: South Yorks.

#16 Re: Rozenblit 300B SEOTL 1.5W

Post by Cressy Snr »

Ray P wrote: Thu Mar 09, 2017 7:22 am See, I told you so! :thumbup:
Yes, I must admit I was a bit hasty judging them.
Sgt. Baker started talkin’ with a Bullhorn in his hand.
steve s
Shed dweller
Posts: 2829
Joined: Wed May 30, 2007 6:19 pm
Location: east yorks

#17 Re: Rozenblit 300B SEOTL 1.5W

Post by steve s »

Ray P wrote: Sun Feb 26, 2017 8:52 pm
Andrew wrote: Sun Feb 26, 2017 7:19 pm I'm still hoping to hear Ray's at some point.
I would bring them to Owston but they'll under achieve in the large room with sub-optimal speaker efficiency so not sure it would be worth the effort?

Ray
Your welcome to connect up to my speakers Ray, my latest designs are closer to 100db than the 103 db i brought last year, but will still fill the room at moderate levels with 1.5 watts i would think,
I brought a cossor 2P based amp a few years ago and that was ok in the room..thats only a 1/2 watt difference
Cheers..
The tube manual is quite like a telephone book. The number of it perfect. It is useful to make it possible to speak with a girl. But we can't see her beautiful face from the telephone number
Cressy Snr
Amstrad Tower of Power
Posts: 10552
Joined: Wed May 30, 2007 12:25 am
Location: South Yorks.

#18 Re: Rozenblit 300B SEOTL 1.5W

Post by Cressy Snr »

Well these OTLs have been running for a day on a wide variety of music apart from heavy metal and Mahleresque classical.
1.5W aint gonna cut it on metal and Mahler 8; not on my speakers anyhow.
They haven't blown up or caught fire, so I can say I've broken the curse of the OTL.
I've also fallen in love with single-ended 300Bs sans output transformers. They sound like no 300B I've ever heard :shock:
Sgt. Baker started talkin’ with a Bullhorn in his hand.
User avatar
Ray P
No idea why I do this anymore
Posts: 6294
Joined: Thu Nov 22, 2007 5:18 pm
Location: Somerset

#19 Re: Rozenblit 300B SEOTL 1.5W

Post by Ray P »

steve s wrote: Thu Mar 09, 2017 1:55 pmYour welcome to connect up to my speakers Ray...
Now there's a thought, thanks Steve. Owston is still a way off but I'll work on the assumption that I'll bring my 300B SE-OTLs along; it'll give anyone who is unable to beat a path to Steve's door a taste of what they're missing.

Ray
Sorry, I couldn't resist!
User avatar
Ray P
No idea why I do this anymore
Posts: 6294
Joined: Thu Nov 22, 2007 5:18 pm
Location: Somerset

#20 Re: Rozenblit 300B SEOTL 1.5W

Post by Ray P »

Cressy Snr wrote: Thu Mar 09, 2017 7:54 pmI've also fallen in love with single-ended 300Bs sans output transformers. They sound like no 300B I've ever heard
Uncle Ray is very pleased that you're enjoying them so much Steve, what they do is special isn't it.

For me your positive comments are a kind of relief too as often the only comment I receive when I mention them refers to the price of eight 300Bs just to get 1.5 watts. Any takers on your offer yet?

Ray
Sorry, I couldn't resist!
Cressy Snr
Amstrad Tower of Power
Posts: 10552
Joined: Wed May 30, 2007 12:25 am
Location: South Yorks.

#21 Re: Rozenblit 300B SEOTL 1.5W

Post by Cressy Snr »

Ray P wrote: Thu Mar 09, 2017 9:09 pm
Cressy Snr wrote: Thu Mar 09, 2017 7:54 pmI've also fallen in love with single-ended 300Bs sans output transformers. They sound like no 300B I've ever heard
Any takers on your offer yet?

Ray
Nope.

Yes the amps do something not many others do. A real "Windolene" of an amp :)
Sgt. Baker started talkin’ with a Bullhorn in his hand.
Cressy Snr
Amstrad Tower of Power
Posts: 10552
Joined: Wed May 30, 2007 12:25 am
Location: South Yorks.

#22 Re: Rozenblit 300B SEOTL 1.5W

Post by Cressy Snr »

The 300B OTL is now packed away and bubble wrapped, ready for the customer to collect.
A unique amplifier and I'm glad I got to hear what it does.
Sgt. Baker started talkin’ with a Bullhorn in his hand.
Andrew
Eternally single
Posts: 4206
Joined: Thu May 24, 2007 2:18 pm

#23 Re: Rozenblit 300B SEOTL 1.5W

Post by Andrew »

If Uncle Ray can bring his OTL with him, then that's a great excuse to come along to Owston.
Analogue, the lost world that lies between 0 and 1.
Cressy Snr
Amstrad Tower of Power
Posts: 10552
Joined: Wed May 30, 2007 12:25 am
Location: South Yorks.

#24 Re: Rozenblit 300B SEOTL 1.5W

Post by Cressy Snr »

Have just reassembled the OTL ready for tomorrow.
I figured that the guy would want to hear it working before taking it away
(well that's my excuse and I'm sticking to it) :lol: :wink:

Listening to it again, I can be happy that I've now brought the EL34 PP monoblocks up to a musical standard that is close to these amps.
But.....the musical communication these things possess remains stubbornly spot-on.

I've found, by tweaking the Barbariks, that good EL34 push-pull pair's tone can be made remarkably similar to 300B tone, when the EL34s are operated as pentodes with plate-to-grid feedback.

Can't deny however that this Rozenblit 300B OTL is bloody good. 8)
Sgt. Baker started talkin’ with a Bullhorn in his hand.
Cressy Snr
Amstrad Tower of Power
Posts: 10552
Joined: Wed May 30, 2007 12:25 am
Location: South Yorks.

#25 Re: Rozenblit 300B SEOTL 1.5W

Post by Cressy Snr »

One satisfied customer off home with the amps and a ruddy great grin. :D
Sgt. Baker started talkin’ with a Bullhorn in his hand.
Cressy Snr
Amstrad Tower of Power
Posts: 10552
Joined: Wed May 30, 2007 12:25 am
Location: South Yorks.

#26 Re: Rozenblit 300B SEOTL 1.5W

Post by Cressy Snr »

Had a lovely email from the customer earlier this evening.
He is over the moon with the way these amps sound with his 105dB/W horns. "Unbelievable clarity and detail and so musical" was one of the comments.
A job well done then. :)
Sgt. Baker started talkin’ with a Bullhorn in his hand.
simon
Thermionic Monk Status
Posts: 5600
Joined: Thu May 24, 2007 11:22 am
Location: People's Republic of South Yorkshire

#27 Re: Rozenblit 300B SEOTL 1.5W

Post by simon »

Excellent stuff Steve! Really rather regret not hearing them.
User avatar
Ray P
No idea why I do this anymore
Posts: 6294
Joined: Thu Nov 22, 2007 5:18 pm
Location: Somerset

#28 Re: Rozenblit 300B SEOTL 1.5W

Post by Ray P »

simon wrote: Sun Mar 19, 2017 10:26 pm Excellent stuff Steve! Really rather regret not hearing them.
All being well you'll be able to hear my version at Owston.

Ray
Sorry, I couldn't resist!
User avatar
Ray P
No idea why I do this anymore
Posts: 6294
Joined: Thu Nov 22, 2007 5:18 pm
Location: Somerset

#29 Re: Rozenblit 300B SEOTL 1.5W

Post by Ray P »

Cressy Snr wrote: Sun Mar 19, 2017 10:10 pm Had a lovely email from the customer earlier this evening.
He is over the moon with the way these amps sound with his 105dB/W horns. "Unbelievable clarity and detail and so musical" was one of the comments.
A job well done then. :)
Good stuff Steve; another member for our small elite club! :D

Rozenblit isn't everyone's cup of tea but he does produce some very good kits. All three of his SE-OTL kits (original SE-OTL, MiniBeast and 300B SE-OTL) are fantastic amplifiers.

Ray
Last edited by Ray P on Mon Mar 20, 2017 9:18 pm, edited 1 time in total.
Sorry, I couldn't resist!
simon
Thermionic Monk Status
Posts: 5600
Joined: Thu May 24, 2007 11:22 am
Location: People's Republic of South Yorkshire

#30 Re: Rozenblit 300B SEOTL 1.5W

Post by simon »

Ray P wrote: Mon Mar 20, 2017 8:50 pm All being well you'll be able to hear my version at Owston.

Ray
Sadly I can't make Owston this time :-(
Post Reply