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How a SRPP stage sounds like?
How a SRPP stage sounds like?
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Old 26th May 2011, 06:28 PM   #1
rvrazvan is offline rvrazvan  Romania
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Default How a SRPP stage sounds like?

I have heard only SE and PP amps with SE driver stages.
How does a SRPP stage sounds like and what are the advantages/disadvantages of it(sonical).
It might sound silly but i don;t know what to expect.
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Old 27th May 2011, 12:50 AM   #2
aardvarkash10 is offline aardvarkash10  New Zealand
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you are right. It sounds silly.

The advantages and disadvantages of SRPP are well outlined and discussed in many articles, most germainely John Broskie's SRPP Deconstructed
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Old 27th May 2011, 12:55 AM   #3
nigelwright7557 is offline nigelwright7557  United Kingdom
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I use an SRPP front end on my valve/MOSFET hybrid amps and have been very pleased with it. It has a clean sound.
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Old 27th May 2011, 12:42 PM   #4
bigwill is offline bigwill  United Kingdom
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If it's well designed, it will have little to no sonic character.
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Old 27th May 2011, 07:53 PM   #5
lcsaszar is offline lcsaszar  Hungary
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If you use cathode capacitor at the bottom tube cathode resistor, the sound character is greatly influenced by that capacitor. Sound is also very dependent on the PSU (I prefer C-R-C filter, but again the C matters). Finally, the tube itself. I prefer ECC88/6DJ8 for line stage, it has clean, a bit analytical sound. If you prefer "soft tube sound", go for ECC83, but this is unnatural for some. SRPP requests high load impedance, otherwise distortion goes up.
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Old 27th May 2011, 09:33 PM   #6
aardvarkash10 is offline aardvarkash10  New Zealand
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Quote:
Originally Posted by oshifis View Post
If you use cathode capacitor at the bottom tube cathode resistor, the sound character is greatly influenced by that capacitor. Sound is also very dependent on the PSU (I prefer C-R-C filter, but again the C matters). Finally, the tube itself. I prefer ECC88/6DJ8 for line stage, it has clean, a bit analytical sound. If you prefer "soft tube sound", go for ECC83, but this is unnatural for some. SRPP requests high load impedance, otherwise distortion goes up.
An interesting range of assertions. Whats the reasoning behind them?

SRPP was generally used for driving into constant, low Z loads. Bear that in mind before attempting to optimise the circuit as a voltage amp, especially into a varying G1 load
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Old 27th May 2011, 09:37 PM   #7
nigelwright7557 is offline nigelwright7557  United Kingdom
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Quote:
Originally Posted by oshifis View Post

SRPP requests high load impedance, otherwise distortion goes up.
Old valve TV's used SRPP for driving loudspeakers.
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Old 27th May 2011, 09:45 PM   #8
SY is offline SY  United States
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How a SRPP stage sounds like?
SRPP was actually used for video scan, not audio amps (See Amos and Birkenshaw). The circuit was indeed most useful for low impedances, especially with capacitive reactances and the high voltages needed for scan circuits. Merlin Blencoe published a very nice article showing that the distortion actually has a minimum at a relatively low load and it's a pretty sharp minimum. It's not as low distortion as a more conventional circuit, but definitely lower than running the circuit into a high impedance load. A variable load is not a good idea.

Topologies don't have a "sound." Specific implementations can, but presumably we want hifi, which means that the electronics do not contribute a "sound." if one wants an effects box, there are more efficient ways of achieving it.
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Old 27th May 2011, 10:25 PM   #9
sheep is offline sheep  Canada
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I haven't tried this but what does a solid state CCS as the load and LED in the bottom cathode sound like?
The top tube of the SRPP acts like a CCS if the load impedance is high but as a push-push when the load is low according to John Broskie.
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Old 27th May 2011, 10:42 PM   #10
SY is offline SY  United States
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How a SRPP stage sounds like?
I use that topology routinely (see His Master's Noise on this site and the ImPasse in AudioXpress for examples). You do have to buffer the output or account for the next stage load. It's very low distortion, and if you choose a good operating point and a low distortion tube, it's audibly transparent.
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