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Sony TA-4650 VFet, Philips 7851 Lab series & Sony STR-V4
|Posted on August 12, 2012 at 18:47:13|
Frankly, a later era Sony STR-V4 handily outperforms the Sony TA-4650 VFet. The STR-V4 is much more musical by a long shot, bass is far better & tight, midrange more detailed without grain & treble is sweet.
The Philips 7851 is also far superior sonically to the TA-4650. I think I would take the Sony STR-V4 over the Philips though as it is more musical. The STR-V4 is a serious sleeper with a good tuner section too. I am going thru this STR-V4 with better components & will report back.
Frankly, the TA-4650 is a disappointment, but I am having fun.
|You might find this interesting..., posted on August 13, 2012 at 08:29:23|
Location: New England
Joined: January 12, 2003
Articles about Sony V-Fet amps...
"When you think everything is someone else's fault, you will suffer a lot."
|RE: Sony TA-4650 VFet, Philips 7851 Lab series & Sony STR-V4, posted on August 13, 2012 at 11:52:33|
Joined: June 5, 2000
I have older Sony receivers, a 6120, 6065 and 6045. I also used to have the 6060.
I also have the Philips 785, 796 and 797. The 78 and 79 units are internally the same. The 785 walks all over the 6045 but could not compete against the 6060. The 797 against the 6120 is a tossup. 2 diferent renditions and depending on the speakers each becomes equally satisfying. |I find I tend to put more hours on the 797. The 6065 and 796 tend to sit and gather dust b/c of the 2 upper level units I have.
I can't compare them to the 4650.
Don Brian Levy, J.D.
Toronto ON Canada
|RE: Sony TA-4650 VFet, Philips 7851 Lab series & Sony STR-V4, posted on August 13, 2012 at 12:38:25|
Location: pacific northwest
Joined: December 22, 2003
|Don't let your disappointment with the Sony TA-4650 tuner dissuade you from considering a Sony ST-4950 tuner.|
|RE: Sony TA-4650 VFet, Philips 7851 Lab series & Sony STR-V4, posted on August 13, 2012 at 14:45:27|
|The TA-4650 is an amplifier. The Sony tuners are ST series.|
|BTW- Philips 7851 Lab series vs Sony STR-V4, posted on August 13, 2012 at 15:44:41|
|The Sony STR-V4 will need an outboard phono amp due to the rather lousy built-in phono amp. It is flat sounding & one dimensional. The Philips 7851 way outperforms the Sony with its phono amp.|
|RE: Sony STR-V4 more info, posted on August 13, 2012 at 19:27:23|
The Sony STR-V4 is interesting. The receiver does not have any op-amps, totally discrete design. Also no parallel transistors in the output section- another good sign of simplicity. Sometimes simplicity rules.
Its larger brothers, the STR-V5, V6 & V7 have those HA1457 odd op-amps with 8-pins on one side in the tone control section. The HA1457 do not sound so great compared to say a Burr Brown OPA2604. I normally prefer no-op amps, but the Philips 7851 has two standard 8-pin op amps in the preamp & one in the phono section. The Philips phono section sounds better than the discrete Sony section. Swap the old Philips op-amps out to the OPA2604 for better sonics although the stock is not bad by any means.
The STR-V4 has four gains in the front-end. Not much to braig about, however I find excellent sensitivity & immune to HD FM broadcasts. No selectivity issues either. The HA1196 multiplexer is a better than earlier (not best) IC based multiplexers. Same as Mitsubishi DA-F20 that is in fmtuners top ten list for great sonics or no handicap to the STR-V4. Comparing the STR-V4 to the modded Scott LT-112B that outperformed a modded Citation 18 & Kenwood KT-5020 (top 10 at fmtunerinfo), it is a close call. The Scott has an ever slighty higher resolution at the high frequencies, but I do not hear that slightly irritating haze in the STR-V4 like most op-amp based tuners. (I owned about 30 tuners over the years).
Performing some reasearch, I found a reference that a Pioneer SX-1250 was unseated by the STR-V4 as best sonically performing receiver in an audiophiles collection. However, we all have different personal tastes.
The Sony STR-V4 will get new 10uF polycarbonate coupling caps in all audio coupling circuits replacing the inferior electrolytics plus PS upgrades. I am hoping to make an audio 'monster' out of this receiver.
Speakers used on this STR-V4 are Klipsch Forte with Bob Crites upgrades. The Klipsch usually does not like SS amps, but the Sony sounds good thru the Klipsch speakers. So, the Sony STR-V4 with 55-watts per channel is not infatuation with the new girl on the block. I can already recommend the Sony STR-V4 as long as an aftermarket phono amp is used- not a big deal.
|I love my Sony vfet, posted on August 14, 2012 at 04:16:21|
Location: Saint Paul, Minnesota
Joined: December 20, 2011
and it compared extremely favorably against my 300B SET mono blocks.
I haven't heard the Philips or Sony models you compare it to.
Most if not all vfets require service due to bad choices of diodes "protecting" the vfets that typically shorted out and trashed the vfets.
My current one was gone over and had the diodes replaced as well as all the caps in the signal path.
|RE: Sony TA-4650 VFet, Philips 7851 Lab series & Sony STR-V4, posted on August 14, 2012 at 15:55:14|
Joined: December 11, 2000
|If you decide to sell the 4650, shoot me an email|
|RE: Sony TA-4650 VFet, Philips 7851 Lab series & Sony STR-V4, posted on August 15, 2012 at 15:38:28|
|I got rid of it already. Tnx for offer.|
|RE: I love my Sony vfet, posted on August 15, 2012 at 15:45:08|
|My DIY SE 2A3 kills the TA-4650 Vfet. Perhaps has an issue.|