[Stone]

Hi Nigel

The cab belongs to mac_alex_2203 and was used during the TT meeting we had in mid of September - as Marc told me, he is using beam blockers in order to get rid of the ear piercing and scratchy highs of the Greenbacks. I was impressed by the beam blockers because normally I find the Greenbacks way to high sounding.

My personal favorite combination is what I have used for the last 7 or 8 years: it is one cab loaded with Celestion G12K and the other one with them Craaft speakers; I recently changed the Craaft cab and it has now two Celestion V30 and two of them Craafts.

The V30s itself are a little bit scratchy and do lack some bass to my ears if they are used as a quartet.

Regards, Stone

[mac-alex_2003]

Good morning,

the cab is a 1960AX with two GBs and two V30 mounted as 'X'. The both top speakers have beam blockers, the bottom speakers not.

Yours,
Marc

[darkbluemurder]

#36 mod first mod to 2203/2204

Stage 1 input 33k shield on anode. Cathode 2k7/0.68uf. 470k/500pf  1meg a pot/ 1000pf bright cap silver mica

Stage 2 Shield on anode. Cathode 10k/.1uf  470k/500pf/470k.  500pf over the 100k plate resistor

Stage 3 Shield on anode. Cathode 10k/.1uf  470k/500pf/470k. 500pf over the  100k plate resistor

Stage 4 Cathode 820r/0.47uf. Tone stack 33k/250pf the rest stock

100pf fizz cap

NFB 100k/0.1uf

Make sure that the shield is on anode or it will not work.
It will be just one big hiss oscillation machine

Hi Nigel,

Many thanks for summarizing the #36 mod - these are the specs as I understood them from the various posts in the Metroamp forum. I have not tried them personally but that should definitely be much more gainy and have more midrange than the #39 version I tried. And indeed - I did not have any plate caps or plate shields and it was very noisy when I added cathode bypass caps to the 10k resistors.

BTW I moved on from my #39 conversion and changed some of the parts.

Stage 1: input 33k, shielded cable, Rk 2k7, Ck 0.68uf, Ra 100k, Ca 220pf, 22nf coupling cap, 1 Meg II 680pf into 1MA gain w/ 1000pf bright cap
Stage 2: Rk 1k5, Ck 1uf, Ra 100k, voltage divider 470k into 470k II 220pf, 
Stage 3: Rk 10k, no Ck, Ra 100k, 470k into 220nf then 470k to ground
Stage 4: Rk 1k, no Ck, Ra 100k
Stage 5: standard Marshall cathode follower

Tone Stack: slope 56k, treble 250pf/220kB, bass 47nf/1MA, mid 22nf, 25kB

Power amp: standard Marshall Bass amp, 100pf fizz cap, 47k/8 ohms NFB, 0.68uf presence cap. I may change the NFB to 100k/8 ohms and the presence cap to 0.1uf.

Cheers Stephan

[dukeamps]

Hi Nigel

The cab belongs to mac_alex_2203 and was used during the TT meeting we had in mid of September - as Marc told me, he is using beam blockers in order to get rid of the ear piercing and scratchy highs of the Greenbacks. I was impressed by the beam blockers because normally I find the Greenbacks way to high sounding.

My personal favorite combination is what I have used for the last 7 or 8 years: it is one cab loaded with Celestion G12K and the other one with them Craaft speakers; I recently changed the Craaft cab and it has now two Celestion V30 and two of them Craafts.

The V30s itself are a little bit scratchy and do lack some bass to my ears if they are used as a quartet.

Regards, Stone

Hi stone, Cheers thanks for the info

Nigel

[dukeamps]

Good morning,

the cab is a 1960AX with two GBs and two V30 mounted as 'X'. The both top speakers have beam blockers, the bottom speakers not.

Yours,
Marc

Hi Marc, I was thinking about doing that myself, I have 2 extra g12h30 heritage & a box with 4x12 scumback m75s. I'm going to swap 2 out & replace them with the g12h30s see how it sounds.

Cheers

Nigel 

[dukeamps]

Hi Nigel,

Many thanks for summarizing the #36 mod - these are the specs as I understood them from the various posts in the Metroamp forum. I have not tried them personally but that should definitely be much more gainy and have more midrange than the #39 version I tried. And indeed - I did not have any plate caps or plate shields and it was very noisy when I added cathode bypass caps to the 10k resistors.

BTW I moved on from my #39 conversion and changed some of the parts.

Stage 1: input 33k, shielded cable, Rk 2k7, Ck 0.68uf, Ra 100k, Ca 220pf, 22nf coupling cap, 1 Meg II 680pf into 1MA gain w/ 1000pf bright cap
Stage 2: Rk 1k5, Ck 1uf, Ra 100k, voltage divider 470k into 470k II 220pf, 
Stage 3: Rk 10k, no Ck, Ra 100k, 470k into 220nf then 470k to ground
Stage 4: Rk 1k, no Ck, Ra 100k
Stage 5: standard Marshall cathode follower

Tone Stack: slope 56k, treble 250pf/220kB, bass 47nf/1MA, mid 22nf, 25kB

Power amp: standard Marshall Bass amp, 100pf fizz cap, 47k/8 ohms NFB, 0.68uf presence cap. I may change the NFB to 100k/8 ohms and the presence cap to 0.1uf.

Cheers Stephan

Hi Stephan, thanks for the info, here is a link to a Caswell modded amp, maybe you guys would like to analyse it & draw up a schem.

link  http://picasaweb.google.com/Stratocaster64/Plexi02?authkey=Gv1sRgCNi9_dnO2oj2Vw#

I think someone said it was 1 of George lynch's amps. Looks very like a #39 mod.
Cheers

Nigel

[darkbluemurder]

Well, the interesting thing is that my Splawn-style modded 100 watter sounds a lot closer to Dokken/Lynch Mob than my #39 mod ever could. The #39 was just clear, clearer, clearest.

Cheers Stephan

[dukeamps]

Well, the interesting thing is that my Splawn-style modded 100 watter sounds a lot closer to Dokken/Lynch Mob than my #39 mod ever could. The #39 was just clear, clearer, clearest.

Cheers Stephan

Hi Stephen, have you any clips of your amp?

Cheers

Nigel

[darkbluemurder]

Hi Nigel,

Unfortunately I am not set up for clips. I do not have any recording equipment.

Cheers Stephan

[dukeamps]

Hi Nigel,

Unfortunately I am not set up for clips. I do not have any recording equipment.

Cheers Stephan

Hi Stephan, ok

Cheers

Nigel

[Stone]

Hi Nigel

Tried another recording and uploaded it to YT http://www.youtube.com/watch?v=GDpoiYWk22s - it comes a little bit closer than the other one.

Regards, Stone

[cca88]

Hi Nigel

Tried another recording and uploaded it to YT http://www.youtube.com/watch?v=GDpoiYWk22s - it comes a little bit closer than the other one.

Regards, Stone

enotS iH
tleW etrhekrev

 nehcoJ eßürG

[Stone]

Stimmt ...

http://www.youtube.com/watch?v=HYlwi4Le4TI&feature=mfu_in_order&list=UL

Danke, Stone

[cca88]

Stimmt ...

http://www.youtube.com/watch?v=HYlwi4Le4TI&feature=mfu_in_order&list=UL

Danke, Stone

Aaah

klingt doch gleich ganz anders , gell

Grüße

Jochen

[dukeamps]

Hi stone, sounds good, what differences have you made?

Cheers

Nigel