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Old 31st May 2013, 12:33 PM   #111
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I ordered the Sylvana (RCAbranded) 6L6GCs and the RCA 12AX7 now
I found a source for the 807 General Electric as well, but not for 807 RCA.
How performs the 807 GE ? Is it comparable with 807 RCA ?
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Old 4th June 2013, 01:22 AM   #112
vkung is offline vkung  Canada
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RCA 807 is superior than GE. It is around $50 per pair in Ebay.
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Old 4th June 2013, 07:22 AM   #113
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Thank you.
The Sylvana 6L6GCs are already on the way to me, as well as the RCA 12AX7. I try to get a pair of RCA 807s and make a comparison. It will
take some time, maybe in July timeframe i will have a result.
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Old 4th June 2013, 07:49 PM   #114
vkung is offline vkung  Canada
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I have a very good result with Telefunken 12Ax7 and RCA 6L6GC
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Old 28th July 2013, 10:08 AM   #115
MickRS is offline MickRS  Netherlands
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So, after introducing myself a few minutes ago, I can start asking questions with a clear conscience...

I'm going to built myself this kit, but as I'm spending money right now, why stop? So I'm thinking of upgrading right away. Based on the Positive Review i want to upgrade to Supply capacitor and the coupling caps.

Can someone tell me what i need? I want to use the v-cap capacitors and the mundorf supply capacitor mentioned. Which ones do I need (specifications)?
Also thinking of an upgrade of the volume pot. Any suggestions?

Looking forward to your suggestions....
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Old 1st August 2013, 01:31 AM   #116
vkung is offline vkung  Canada
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You can replace the 4 0.1mfd PP coupling caps to oil cap.
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Old 29th August 2013, 06:41 PM   #117
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I'm looking at buying the TU-879S kit, and I'd like to know a few things first. What modifications are recommended during the kit assembly.
I see oil caps are recommended, as well as a tube upgrade. What about eliminating the feedback loop? or bypassing the volume control?
Also, what is the life expectancy of the stock tubes?
And what will the proper R-core transformer cost?
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Old 29th August 2013, 07:08 PM   #118
vkung is offline vkung  Canada
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I'm looking at buying the TU-879S kit, and I'd like to know a few things first. What modifications are recommended during the kit assembly.

I see oil caps are recommended, as well as a tube upgrade.
I recommend to replace the pp capacitors to good oil caps.
You can replace the volume pot to TKD 2Cp601.


What about eliminating the feedback loop? I don't recommend to eliminate the NFB loop

or bypassing the volume control?it is ok
Also, what is the life expectancy of the stock tubes?it depends on a of lot factors but under nornal usage the stock 6L6 should have 2000 hours
And what will the proper R-core transformer cost? $85

If you want more upgrade options, I recommend you to look at TU-8230.
For $250 more, this amp is far superior then TU-879s in all respect.
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Old 30th August 2013, 11:45 AM   #119
Gobble is offline Gobble  India
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Quote:
Originally Posted by Joseph Crowe View Post
I'm looking at buying the TU-879S kit, and I'd like to know a few things first. What modifications are recommended during the kit assembly.
I see oil caps are recommended, as well as a tube upgrade. What about eliminating the feedback loop? or bypassing the volume control?
Also, what is the life expectancy of the stock tubes?
And what will the proper R-core transformer cost?
I am using the SED winged =C= 6L6 tubes and it is clearly better at harmonics than the EH 6L6. Hard to go back to the EH after that - so much is missing without it. The online reviews are true when they praise this tube for harmonic bloom.

--Gobble
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Old 30th August 2013, 03:17 PM   #120
vkung is offline vkung  Canada
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A lot TU-879S builders love this par of tubes - RCA 807 or Sylvania 5933WA
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