Author Topic: R2R Valve Preamp (Fallsaudio)  (Read 1718 times)

Offline vitavoxdude

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R2R Valve Preamp (Fallsaudio)
« on: March 08, 2014, 01:41:08 PM »
Steve, Paul Baker....Vv outputs for R2R, prey tell more, you have my interest pointing at 10 :-*
V
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Offline fallsaudio

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Re: R2R Valve Preamp (Fallsaudio)
« Reply #1 on: March 08, 2014, 04:37:55 PM »
Steve, Paul Baker....Vv outputs for R2R, prey tell more, you have my interest pointing at 10 :-*
V
Hi Paul here ( fallsaudio)
                               Yes I have made some of these tape tube Preamp stages for stevenvalve and others, the results were really superb. It is easy to attach to it your R2R machine. It is simply attached on the volume pots in your R2R machine , this bypasses unfriendly op amps in the last couple of stages.
                               The unit consists of 1 X fullwave rectifier and 3 x amplifiers tubes. Each channel has it own volume pot. The are quite a few options with the type of parts that can be used : eg  type of case (Chassis), tubes, caps, pots , etc

                   
                                                                                                                                                               Paul  ( fallsaudio)
« Last Edit: March 11, 2014, 03:41:57 PM by fallsaudio »

Offline fallsaudio

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Re: R2R Valve Preamp (Fallsaudio)
« Reply #2 on: March 11, 2014, 03:42:27 PM »
 :) Sorry I should have made it clear to all, This preamp does not bypass the IEC stage. To work out a curve correction stage for each manufacture (as all heads have a different impedance) It would be a nightmare. Each manufacture uses a lot of resources to get the best curve for each of these machines. There is no guarantee there will be any benefit rebuilding it, so why change it.
If you want to buy a tape preamp with switchable input impedance you will have to look elsewhere. The original preamp has many nasty noisy op amps. They need to be eliminated. 
This tape preamp will bypass the original cheap preamplifier built into your reel to reel, and eliminate those nasty op amps poor sound, and the associated noise, the only part left will be the original manufactures curve from the heads. Your reel to reel will graduate into the best playback money can buy, including vinyl. You will have that beautiful warm tube sound.  I will build the reel to reel valve output, in a rack mounted case starting price of $850 finished with basic valves like (6x4 , 6cg7s , 6sn7) . If you would like me to upgrade parts, like different types of valves, duelund output capacitors etc, it's at an extra cost. For those interested just send me a PM
Ask Stevevalve what he thinks of the sound with and with out this tube stage.
« Last Edit: March 28, 2014, 08:25:42 PM by fallsaudio »

Offline fallsaudio

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Re: R2R Valve Preamp (Fallsaudio)
« Reply #3 on: March 28, 2014, 09:25:55 PM »
Hi to all ,
            Here are some picture of the finished Preamp . There are a couple parts in the picture which have been up graded to a higher quality . The choices are up to each person and how deep your pocket is.
             
« Last Edit: March 28, 2014, 09:38:33 PM by fallsaudio »

Offline Jehuty

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Re: R2R Valve Preamp (Fallsaudio)
« Reply #4 on: March 29, 2014, 07:13:36 AM »
Quality build as usual from Paul Baker. I need to ring my bank manager and get one for my Tascam  :)
Not all that matters can be measured, not all that can be measured matters.

Offline fallsaudio

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Re: R2R Valve Preamp (Fallsaudio) The next level
« Reply #5 on: July 13, 2014, 03:05:05 PM »
 ;D  Well I thought it was time to get the pre amp out of the proto box . I have added a switch tape 1 and tape 2 two . No dig deal you might say. Well wait there is more . The oil filled has gone to a Dubilier 10 and the 120 mfd has now gone to a 220mfd 450 v Jenson all the input and output RCA are red copper even the power in is a red copper . This thing is super quite but sound unbelievable . Not a cheap unit but well worth the time and effort .

Offline hedalfa

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Re: R2R Valve Preamp (Fallsaudio)
« Reply #6 on: July 13, 2014, 04:15:20 PM »
Looks great............ the next level I like the sound of that.

Offline stevenvalve

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Re: R2R Valve Preamp (Fallsaudio)
« Reply #7 on: July 13, 2014, 05:21:18 PM »
Looks good, Stuffed with quality toys i see.