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Old 20th August 2009, 09:40 AM   #1
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Default Tube rollers - what tubes for my RH84?

I'm about to commence building my first tube amp, an RH84.

The tube complement is

1 off 5U4 rectifier
1 off ECC81
2 off EL84

I'm not interested in hearing about unobtainium, but what have RH84 builders out there found to be sweet tubes, or sweet combo's?

* Yes, I know sound quality depends on the iron and also on the passives, but I want to limit this discussion to experience of tubes in this amp.

What should I buy?

cheers

Doug
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Old 20th August 2009, 09:48 AM   #2
Klimon is offline Klimon  Belgium
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Do try the philips/mullard manufactured el84's. These can be branded Valvo/dario/miniwatt... but sound equally fantastic.

Simon
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Old 21st August 2009, 06:26 AM   #3
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Thanks Simon.
Anyone else with a recommendation?

Doug
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Old 21st August 2009, 07:27 AM   #4
NICKEL is offline NICKEL  New Zealand
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I've tried a few, the cheap Russian NOS are pretty good. Certainly not night and day compared to Teles or Amprex. To be honest - I've lost interest in tube rolling - its cost heaps, with no corresponding payback compared to say drivers and amps.
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Old 22nd August 2009, 02:24 PM   #5
disco is offline disco  Netherlands
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Use quality capacitors for C1 (10uF-350V), it pays off.
For the power supply use a beafy transformer (250mA HT), this is my setup.

Must admit that this amp sounds much bigger than the 5+5W it puts out
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Old 22nd August 2009, 02:37 PM   #6
kevinkr is offline kevinkr  United States
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The Russian 6P14P-EV or ER is a good sounding 6BQ5 equivalent and quite rugged - readily available on eBay for little money. It is one of the nicer sounding tubes I have tried in some hi-fi SE amps. Compared them to Telefunken 6BQ5 and GE 7189A. IMO it was better sounding than the GE, and I thought was very comparable to the Teles.

Give 'em a shot..
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Old 22nd August 2009, 02:46 PM   #7
disco is offline disco  Netherlands
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The ECC81 I liked best was NOS Mullard. Also old production Philips and Brimar are excellent. When buying used tubes be sure they measure up to spec because there's a lot of worn out junk for sale. Don't pay more than 15 - 20 euro for a NOS ECC81.
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Old 23rd August 2009, 07:49 AM   #8
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Thanks Guys. Good stuff!

Disco, can you translate "lichtnet" for me pls?

Doug
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Old 23rd August 2009, 08:57 AM   #9
disco is offline disco  Netherlands
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Don't you have a lichtnet downunder?
Man, you're missing something
Try mains instead
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Old 23rd August 2009, 04:16 PM   #10
kevinkr is offline kevinkr  United States
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Quote:
Originally Posted by kevinkr View Post
The Russian 6P14P-EV or ER is a good sounding 6BQ5 equivalent and quite rugged - readily available on eBay for little money. It is one of the nicer sounding tubes I have tried in some hi-fi SE amps. Compared them to Telefunken 6BQ5 and GE 7189A. IMO it was better sounding than the GE, and I thought was very comparable to the Teles.

Give 'em a shot..

I should have noted while not exactly identical to the RH84 the amplifier in question was based on the RH84 and is generally similar. (Same principal of operation, just a few values tweaked - the amp was not one of mine.)
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