Herron phono

bigdx · 26th April 2007, 07:46 PM

Hi

Can anybody help me with a Herron VTPH circuit diagram? I want to upgrade the coupling caps. I would like to avoid the couplers in the RIAA stage.

If no circuit diagram available, is there anybody out there that has done a Herron that can send me a photo?

Thanks
Paul

Johan Potgieter · 28th April 2007, 01:03 AM

Hi Bigdx,

The diagram does not appear to be available - but I bet you also googled. What I did find were comments on rediculous "deviation" from RIAA like 0.2 dB, capacitors costing >$25 etc., ..... Which brings me, as an experienced EE, to ask why one wants to change? It is of course your money and property, but still, having read some of the comments .....

Respectfully hoping you are not under the influence of some of those.

Regards.

bigdx · 28th April 2007, 04:43 PM

Hi Johan

I am thinking the sonic qualities of teflon film caps like the TFTF V-Cap is far superior than those of a polypropylene. I have upgraded a number of amps and generally liked the result. I have replaced one stereo pair in the Herron already, and the results are (to my ear) nothing less than stunning.

I want to leave the caps in a RIAA alone – I believe Keith matches them by hand to get the equalization spot on. A circuit diagram would have been quite helpful in identifying the coupling caps that are situated in the RIAA stage.

Regards
Paul

fdegrove · 28th April 2007, 09:35 PM

Hi,

You could unsolder them then measure them with a capacitance meter if there are no value markings present.

Cheers,

26th April 2007, 07:46 PM	#1
bigdx diyAudio Member Join Date: Jan 2007	Herron phono Hi Can anybody help me with a Herron VTPH circuit diagram? I want to upgrade the coupling caps. I would like to avoid the couplers in the RIAA stage. If no circuit diagram available, is there anybody out there that has done a Herron that can send me a photo? Thanks Paul

28th April 2007, 09:35 PM	#4
fdegrove diyAudio Senior Member Join Date: Aug 2002 Location: Belgium	Hi, You could unsolder them then measure them with a capacitance meter if there are no value markings present. Cheers, __________________ Frank

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28th April 2007, 01:03 AM	#2
Johan Potgieter diyAudio Member Join Date: May 2005 Location: Pretoria, South Africa	Hi Bigdx, The diagram does not appear to be available - but I bet you also googled. What I did find were comments on rediculous "deviation" from RIAA like 0.2 dB, capacitors costing >$25 etc., ..... Which brings me, as an experienced EE, to ask why one wants to change? It is of course your money and property, but still, having read some of the comments ..... Respectfully hoping you are not under the influence of some of those. Regards.

28th April 2007, 04:43 PM	#3
bigdx diyAudio Member Join Date: Jan 2007	Hi Johan I am thinking the sonic qualities of teflon film caps like the TFTF V-Cap is far superior than those of a polypropylene. I have upgraded a number of amps and generally liked the result. I have replaced one stereo pair in the Herron already, and the results are (to my ear) nothing less than stunning. I want to leave the caps in a RIAA alone – I believe Keith matches them by hand to get the equalization spot on. A circuit diagram would have been quite helpful in identifying the coupling caps that are situated in the RIAA stage. Regards Paul

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