Bottlehead Forum

Bottlehead Kits => Legacy Kit Products => Quickie => Topic started by: charger on November 11, 2013, 04:17:15 AM

Title: lack of highs
Post by: charger on November 11, 2013, 04:17:15 AM

I hear a lack of highs in my system, i am considering if it's becouse coupling caps i placed , two 2,2 uf Munforf Supreme bypassed by two 0,22 uf Mundof Supreme , may be that the bypass cap is  not necessary ?

thank you

Title: Re: lack of highs
Post by: Grainger49 on November 11, 2013, 04:21:00 AM

The Mundorf caps I have in my system have good clean highs.  But you need to break in film caps. 

How many hours have they played music?  Film need at least 4 days of music passing through them.

Title: Re: lack of highs
Post by: corndog71 on November 11, 2013, 04:57:11 AM

Quote from: charger on November 11, 2013, 04:17:15 AM

I hear a lack of highs in my system, i am considering if it's becouse coupling caps i placed , two 2,2 uf Munforf Supreme bypassed by two 0,22 uf Mundof Supreme , may be that the bypass cap is  not necessary ?

thank you

Try taking out the bypass caps and letting the bigger caps break in some more.

Title: Re: lack of highs
Post by: charger on November 11, 2013, 05:22:30 AM

it's two weeks now i have placed them , and heard music a couple of hours a day so it' s 30 hours or so , now four days are 96 hours

Title: Re: lack of highs
Post by: charger on November 11, 2013, 05:46:27 AM

also I found that damping too much tubes it reproduces a damped sound

Title: Re: lack of highs
Post by: Grainger49 on November 11, 2013, 02:32:39 PM

I suggest you put your CD player in repeat and burn in the Quickie.  The amp doesn't need to be on, it just needs the load of the amp's input.

Title: Re: lack of highs
Post by: charger on December 03, 2013, 01:25:25 AM

I can't understand, yesterday sound was really bright, dynamic , powerfull, today it is slow , darkish , what happens ? is it that capacitors are still breaking in ?

Title: Re: lack of highs
Post by: Doc B. on December 03, 2013, 05:25:02 AM

You might check your batteries' charge.

Title: Re: lack of highs
Post by: charger on December 03, 2013, 05:53:32 AM

oh ok !!

Title: Re: lack of highs
Post by: charger on December 04, 2013, 07:14:28 AM

under which voltage is better to change batteries ?

Title: Re: lack of highs
Post by: danielehn on February 04, 2015, 09:57:15 AM

I don't know if it's just mine, but using rechargeable D-Cells reduces the sound quality noticeable since they are usually 1.2V and not 1.5V

Somewhere around 1.35 the sound quality have dropped  to a noticeable lvl

Title: Re: lack of highs
Post by: Paul Joppa on February 04, 2015, 02:34:14 PM

I've seen a wide variety of specifications and claims for dry-battery filament tube voltage. Most commercial-use tubes for battery radios (like the 3S4) are performance-specified at 1.4 volts, but most hearing-aid tubes, powered by the same kind of batteries, are specified at 1.25 volts. In fact, some mil-spec versions of regular radio tubes call for 1.25v +/- 0.25v - they are the same tube, only the spec has changed.

In the very earliest days, a rheostat was used to adjust dry-battery tubes to 1.1v, it was periodically adjusted to maintain the voltage as the battery ran down. (This is the origin of the 5-v tube too, with a rheostat and a 6-volt lead-acid battery.) In one RCA manual, the recommended range was 1.25-1.4 volts with a nominal 1.3 volts; an absolute maximum of 1.6 volts was called out.