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Time for a Rachel Re-do? (Read 1681 times)
Rivieraranch
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Time for a Rachel Re-do?
07/22/21 at 10:24:36
 
As with the Zen amp, which nobody has yet to return, and now the Torii MK V, this amp, too, should be under revision.

The two things I did not like about this amp was the laid back input bias and the clipping before achieving higher volume.
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DPC
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Re: Time for a Rachel Re-do?
Reply #1 - 07/22/21 at 16:30:53
 
Rachel has been in the house for over eight years and is an end game for me.  Love this amp!

That said, lately I have had to increase the volume knob more than normal.. My thinking is that it might be time to stuff some new tubes in it.  This set has quite a few hours on em.  O r maybe itís just me that needs new ears.
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CAJames
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Re: Time for a Rachel Re-do?
Reply #2 - 07/22/21 at 18:21:18
 
Quote:
Posted by: Rivieraranch      Posted on: Today at 10:24:36

...The two things I did not like about this amp was the laid back input bias and the clipping before achieving higher volume.


Tweaking the input stage is one thing, but the only way to get more clean volume is more watts (or more efficient speakers) . JMO of course.
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DPC
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Re: Time for a Rachel Re-do?
Reply #3 - 07/23/21 at 00:26:28
 
And, to add to the above, does any body wish to advise me on a more powerful tube to give it a little more poop?

The EL34's in there have absolutely no markings on them. So???

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Rivieraranch
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Re: Time for a Rachel Re-do?
Reply #4 - 07/23/21 at 11:41:45
 
Just get new power tubes. Try the 807 with adapters and see if you like them.
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DPC
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Re: Time for a Rachel Re-do?
Reply #5 - 07/24/21 at 00:12:34
 
Thanks RR, I will investigate that option.
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Rivieraranch
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Re: Time for a Rachel Re-do?
Reply #6 - 07/24/21 at 16:23:47
 
If your power tubes have no markings they could be Chinese, made in bulk for equipment manufacturers to brand.
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hdrider
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Re: Time for a Rachel Re-do?
Reply #7 - 07/24/21 at 22:41:22
 
I would second the ''807 with adaptors'' comment. Really happy with ours and that set up. Let us know what you end up doing and happy listening, Chris.
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DPC
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Re: Time for a Rachel Re-do?
Reply #8 - 07/25/21 at 11:58:56
 
Thanks Gentlemen, the hunt is on!
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Rivieraranch
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Re: Time for a Rachel Re-do?
Reply #9 - 07/25/21 at 11:59:57
 
And, to add to the above, does any body wish to advise me on a more powerful tube to give it a little more poop?

DPC You meant "pop" I hope!
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DPC
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Re: Time for a Rachel Re-do?
Reply #10 - 07/25/21 at 14:34:41
 
OK Pop, I'm not the best with my descriptions.

Googling the 807's, Prices are very attractive. †I'm not much of a "tube roller" and would welcome any advise on reputable vendors.  Amazon has the adaptors.

Am looking forward to trying something new!

Dennis
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DPC
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Re: Time for a Rachel Re-do?
Reply #11 - 07/25/21 at 19:23:59
 
Right or Wrong, I'm intrigued by the 807 tube.  Have been reading everything I can find on the subject.

Now,  the advise on where to get em.
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DPC
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Re: Time for a Rachel Re-do?
Reply #12 - 07/26/21 at 15:21:44
 
Was a good idea or so it seemed, gave up the quest.
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Deep Structure
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Re: Time for a Rachel Re-do?
Reply #13 - 10/16/21 at 00:18:58
 
I found that 807 tubes sound the best in my Rachel. They also look nice with the large bottle shape. I get mine from The Tube Store in Canada. I got the adaptors from Ali Baba. The adaptors were of good quality and arrived quickly. But I did not like the fraudulent $1200 credit card charges that I assume was the act of the seller in China or someone else along the way.

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DPC
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Re: Time for a Rachel Re-do?
Reply #14 - 10/16/21 at 12:50:08
 
"Deep Structure", now that's a interesting name. †Makes me think.

Thanks for the tip on where to look for the 807's.

Last week I looked in my tube drawer and found a pair of Genalex Gold Lion KT88's. †Do not remember where I got them or when. †The boxes say "Cryoset certified" so they gotta be something special.

The data sheet for the SE34 says that you can use the KT88's so I replaced the EL34 tubes. †It could be that the EL34's were a bit tired or it's just me but the KT88's sure sound better to these ears. †The difference is not really huge just better. †Maybe I'll turn into a tube roller after all.

Dennis
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hdrider
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Re: Time for a Rachel Re-do?
Reply #15 - 10/16/21 at 16:09:53
 
Dennis- Looking at a couple of boxes of tubes that have appeared over the last many years, but I think I tried everything that Steve said I could in our Rachel. The EL34 the best until I got some adapters and tried some 807's. I have purchased 807's from RAM Audio Labs, Viva Tubes, Tubeman, and most recent from Mullard Magic across the pond. Glad the KT88's sounded better, that means that the EL34's were due for a change. The nice thing about Steve's designs is that there are a LOT of ways to fine tune your system with tubes and IMO the differences are subtle, but always there. Keep us posted on what you try and settle on, this forum is a awesome source of info. Happy listening, Chris.
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DPC
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Re: Time for a Rachel Re-do?
Reply #16 - 10/16/21 at 17:47:45
 
Hey Chris,
Thanks for your interest in my quest.  It really helps when someone who has been down this path offers help to the unwashed.

On your suggestions I just ordered a matched pair of 807/CV 124 Ferranti British Military tubes from Tube Man.  Ordered a pair of adaptors from Amazon.

I expect it will be a long wait as the adaptors come from China.

In the mean time I'm very happy listening to the KT88's.

Dennis
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Deep Structure
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Re: Time for a Rachel Re-do?
Reply #17 - 10/16/21 at 19:21:58
 
Dennis,
I think you'll be happy with the 807s. I sure was. When you get them I hope you relate your experience with them particularly as compared to the KT 88s.

Don
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DPC
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Re: Time for a Rachel Re-do?
Reply #18 - 10/16/21 at 19:59:09
 
Will do
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Rivieraranch
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Re: Time for a Rachel Re-do?
Reply #19 - 10/16/21 at 20:46:59
 
The National Union 807's sound more old time radio. While the 1970s RCAs are somewhat bright.
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DPC
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Re: Time for a Rachel Re-do?
Reply #20 - 10/16/21 at 22:22:26
 
Thanks for the advise.  This is giving my savings account a work out.
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drford
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Re: Time for a Rachel Re-do?
Reply #21 - 10/21/21 at 17:55:34
 
I have a pair of Brimar/Ferranti 807s and I really like them - I suspect they're from the same batch you purchased from Tube Man. Let us know how you like them.
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DPC
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Re: Time for a Rachel Re-do?
Reply #22 - 10/22/21 at 10:11:13
 
Fingers crossed, waiting for the postman.
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drford
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Re: Time for a Rachel Re-do?
Reply #23 - 10/22/21 at 18:21:02
 
Same - have a couple of 7DJ8's arriving in tonight's mail... can't wait.
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