[TenTec] 565 Low level audio on headphones

[Bob McGraw - K4TAX]

Here's an excellent choice in headphones:

This is the professional series.  Just like a TIMEX.....will take a lickin' 
and keep on tickin'
http://pro.sony.com/bbsc/ssr/product-MDR7506/

Driver size is 40mm
Impedance is 63 ohms
Sensitivity is 106 dB/W/m

Granted they cost more than $19.95 but they are well worth the extra bucks 
as just about every part is available as a replacement if needed.  And if 
you blow a driver, order a replacement.    These new headphones can be 
obtained for under $100 at most places.

This is the consumer/DJ series:
http://store.sony.com/p/DJ-headphones/en/p/MDRV6#specifications

Driver size is 40mm
Impedance is 63 ohms
Sensitivity is 106 dB/W/m

These can be had at most places for about $68.00 or so at most places.  You 
can also get replacement ear pads for these too.

Most good headphones will have an impedance of 25 to 65 ohms and a 
sensitivity of 100 dB/W/m or better.  Driver size will be 30mm to 45mm. 
Actual weight for closed back headphone will range from 7 oz to about 9 oz. 
And expect to spend upwards of $50 or more for new ones.  Good ones will 
have replacement parts available, drivers, cords, cushions and such.

73
Bob, K4TAX



----- Original Message ----- 
From: "Richards" <jruing at ameritech.net>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Sunday, March 10, 2013 8:34 PM
Subject: Re: [TenTec] 565 Low level audio on headphones


> No argument with Barry's suggestion, although I think it would be hard to 
> find more efficient headphones than 8 ohms.
>
> My suggestion is to try an inexpensive headphone amplifier.  These cost 
> from $20 and up - I use this one:
>
> http://tinyurl.com/8cr5kw
>
> I figure the $20 Behringer model and any other one like it should cut it. 
> DO NOT order either of the Ramsey headphone amplifier kits - they 
> knowingly employ noisy op amp chips, which is scandalous considering the 
> terribly poor quality.
>
> Just my take.
>
> ----------------------- K8JHR -------------------------
>
>
> On 3/10/2013 5:41 PM, Barry N1EU wrote:
>> The easiest fix is to switch to higher efficiency headphones.
>>
>> I didn't want to switch.  There are series resistors right at the 
>> headphone
>> jack.
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