diff --git a/src/mame/drivers/alpha68k.c b/src/mame/drivers/alpha68k.c
index 0f1cebe83d0..0ddea9c924e 100644
--- a/src/mame/drivers/alpha68k.c
+++ b/src/mame/drivers/alpha68k.c
@@ -2094,7 +2094,7 @@ static MACHINE_DRIVER_START( alpha68k_II )
 	MDRV_SOUND_CONFIG(ym2203_config)
 	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.65)
 
-	MDRV_SOUND_ADD("ym2", YM2413, 8000000)
+	MDRV_SOUND_ADD("ym2", YM2413, 3579545)
 	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
 
 	MDRV_SOUND_ADD("dac", DAC, 0)
@@ -2142,7 +2142,7 @@ static MACHINE_DRIVER_START( alpha68k_II_gm )
 	MDRV_SOUND_CONFIG(ym2203_config)
 	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.65)
 
-	MDRV_SOUND_ADD("ym2", YM2413, 8000000)
+	MDRV_SOUND_ADD("ym2", YM2413, 3579545)
 	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
 
 	MDRV_SOUND_ADD("dac", DAC, 0)
@@ -2184,7 +2184,7 @@ static MACHINE_DRIVER_START( alpha68k_V )
 	MDRV_SOUND_CONFIG(ym2203_config)
 	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.65)
 
-	MDRV_SOUND_ADD("ym2", YM2413, 8000000)
+	MDRV_SOUND_ADD("ym2", YM2413, 3579545)
 	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
 
 	MDRV_SOUND_ADD("dac", DAC, 0)
@@ -2225,7 +2225,7 @@ static MACHINE_DRIVER_START( alpha68k_V_sb )
 	MDRV_SOUND_CONFIG(ym2203_config)
 	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.65)
 
-	MDRV_SOUND_ADD("ym2", YM2413, 8000000)
+	MDRV_SOUND_ADD("ym2", YM2413, 3579545)
 	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
 
 	MDRV_SOUND_ADD("dac", DAC, 0)